ChatGPT answers, unedited

If your main goal is discovering long-tail keywords and then filtering by search intent + ranking difficulty, these are the strongest options:

• semrush.com — probably the easiest all-in-one choice. You can filter by word count, keyword difficulty, search intent, volume, questions, SERP features, etc. It also automatically groups keywords into topical subgroups. Semrush Semrush
• ahrefs.com — excellent if you want deeper SERP/competition analysis. It supports filtering by intent, KD, volume, traffic potential, branded/local attributes, and can cluster keywords by parent topic. Ahrefs Help Center Ahrefs
• semrush.com — useful for testing the workflow before paying. It exposes keyword suggestions, volume, difficulty, intent, CPC, and long-tail opportunities, although the full Keyword Magic Tool has much larger datasets and more filtering. Semrush

What I'd use

For a workflow like:

Seed keyword → 3+ words → low KD → commercial intent → decent volume

I'd lean toward Semrush because those filters are particularly straightforward. For example, you can combine:

• Word count: 3+
• KD: 0–30
• Intent: Commercial
• Volume: set your minimum
• Questions: optionally enabled
• Exclude irrelevant terms

Semrush also offers Personal Keyword Difficulty, which attempts to adjust difficulty to your particular domain rather than treating every site identically. Semrush

Ahrefs is especially useful if you care about why a keyword is difficult. Its KD is primarily based on the backlink profiles of the top-ranking pages, while its SERP and Traffic Potential data let you inspect the actual competitive landscape. Ahrefs Ahrefs Help Center

One important caveat: don't treat KD as a definitive ranking prediction. It's an estimate, and different tools calculate it differently. For promising long-tail terms, inspect the actual SERP and look at the quality/authority of the pages currently ranking.

If you tell me your niche/site and roughly how authoritative the site is, I can also give you a concrete filtering recipe (e.g. exact KD, volume, intent, and SERP filters) for finding long-tail opportunities.

If your main requirement is “find lots of long-tail keywords, then filter by search intent + keyword difficulty,” these are the main tools I’d look at:

1. Semrush — probably the closest match

semrush.com

Its Keyword Magic Tool is particularly suited to this workflow. You can enter a seed keyword, generate large numbers of related terms, and filter by:

• Keyword difficulty
• Search intent — informational, navigational, commercial, transactional
• Search volume
• Word count
• Questions
• SERP features
• Include/exclude terms

It also automatically organizes keywords into topic/subtopic groups, which is useful for finding long-tail variations rather than manually brainstorming them. Semrush Semrush

2. Ahrefs — excellent if SERP analysis matters

ahrefs.com

Ahrefs' Keywords Explorer can generate thousands of keyword ideas and lets you filter by search intent and keyword difficulty. Its KD score is based primarily on the backlink profiles of the top-ranking pages. Ahrefs Ahrefs Help Center

One useful distinction: Ahrefs also gives you Traffic Potential, which estimates the traffic the top-ranking page receives for a topic. That's often more informative than search volume alone. Ahrefs

3. LowFruits — worth considering for low-competition sites

If your objective is specifically “find long-tail keywords where weaker sites are already ranking,” I'd investigate LowFruits.

Its approach is less about finding the biggest keyword database and more about identifying SERPs where there are signs of weaker competition. That's useful if you're working with a newer/smaller site.

4. SE Ranking — good middle ground

SE Ranking combines keyword suggestions, search volume, difficulty and intent with broader SEO functionality. It's worth considering if you want keyword research plus rank tracking and competitor research without going all the way into the more expensive enterprise-oriented platforms.

The workflow I'd use

Rather than simply searching for keywords with low KD, I'd use:

Seed keyword → long-tail ideas → intent filter → KD filter → SERP check → prioritize

For example, suppose your seed is “project management software.”

You might filter for:

• Intent: Informational + Commercial
• Word count: 4+ words
• KD: 0–30 initially
• Volume: Don't impose an excessively high minimum
• Include: for, small, freelancer, remote, agency, etc.
• Questions: On, if you're looking for informational content

Then manually inspect the SERPs for the most promising terms. This last step matters because KD is an estimate, not a guarantee of ranking difficulty. Ahrefs itself recommends using KD as an initial filter and then analyzing the actual SERP. Ahrefs

If I had to narrow it down: use Semrush if you want the easiest combination of long-tail discovery + intent + KD filtering; use Ahrefs if you care more about detailed competitive/SERP analysis; consider LowFruits if your primary objective is uncovering low-competition opportunities.

If you tell me your site/niche and roughly how authoritative the site is, I can also give you a concrete keyword-research workflow (including the KD/volume/intent filters I'd start with).

If your objective is specifically “find long-tail keywords where weaker sites are already ranking,” I'd investigate LowFruits.

Its approach is less about finding the biggest keyword database and more about identifying SERPs where there are signs of weaker competition. That's useful if you're working with a newer/smaller site.

4. SE Ranking — good middle ground

SE Ranking combines keyword suggestions, search volume, difficulty and intent with broader SEO functionality. It's worth considering if you want keyword research plus rank tracking and competitor research without going all the way into the more expensive enterprise-oriented platforms.

The workflow I'd use

Rather than simply searching for keywords with low KD, I'd use:

Seed keyword → long-tail ideas → intent filter → KD filter → SERP check → prioritize

For example, suppose your seed is “project management software.”

You might filter for:

• Intent: Informational + Commercial
• Word count: 4+ words
• KD: 0–30 initially
• Volume: Don't impose an excessively high minimum
• Include: for, small, freelancer, remote, agency, etc.
• Questions: On, if you're looking for informational content

Then manually inspect the SERPs for the most promising terms. This last step matters because KD is an estimate, not a guarantee of ranking difficulty. Ahrefs itself recommends using KD as an initial filter and then analyzing the actual SERP.

If you want to find long-tail keyword opportunities and filter them by search intent + ranking difficulty, these are the strongest options:

Best overall: Semrush

semrush.com is probably the closest match to your exact workflow:

1. Enter a seed topic.
2. Generate thousands of related keywords.
3. Filter by:

• Keyword difficulty
• Search volume
• Search intent (informational, commercial, transactional, navigational)
• CPC
• Word count / keyword length
• Export your best opportunities. Semrush Semrush

Example filters:

• Keyword difficulty: < 30
• Volume: 50–1,000/month
• Intent: Commercial + Transactional
• Include words like:

• “best”
• “vs”
• “review”
• “pricing”
• “alternative”
• “for [specific audience]”

That usually surfaces keywords with buying intent but less competition.

Best for competitor-driven opportunities: Ahrefs

ahrefs.com is excellent if you want to discover terms competitors already rank for. Its Keywords Explorer lets you find keyword ideas, analyze ranking difficulty, and filter opportunities by metrics such as Keyword Difficulty and search volume. Ahrefs

A common workflow:

1. Put a competitor domain into Site Explorer.
2. Export keywords they rank for.
3. Filter:

• Position: 5–30 (near wins)
• KD: low
• Volume: meaningful
• Create better content targeting those terms.

Best budget option: KWFinder

mangools.com is easier to learn and cheaper than enterprise platforms. It is good for:

• Finding question keywords
• Finding low-competition phrases
• Quickly checking difficulty scores

Best for very low-competition niches: LowFruits

lowfruits.io focuses heavily on finding “weak spots” in Google results:

• Forums ranking
• Low-authority sites ranking
• SERPs where newer sites can compete

It is useful if your site has little authority.

My recommended stack by situation

New website / low authority

• LowFruits → find easy wins
• KWFinder → expand ideas
• Semrush → validate intent

Established site

• Ahrefs → competitor gaps
• Semrush → keyword clustering and intent filtering

Content marketing team

• Semrush + Keyword Insights → build topic clusters and content calendars

A simple scoring formula I’d use:

Opportunity Score = (Intent × Search Volume × Business Value) ÷ Difficulty

For example:

• “how to clean leather shoes” → high traffic potential, low buying intent
• “best waterproof leather shoe protector for hiking” → lower volume, but much stronger commercial intent

For most businesses, the second type is where long-tail keywords become valuable. Semrush

Yes. If your main goal is “find lots of long-tail keywords → filter by intent → filter by ranking difficulty”, I’d shortlist these:

My pick: Semrush

Semrush Keyword Magic Tool is probably the closest match to exactly what you're describing. It lets you generate large keyword sets and filter simultaneously by keyword difficulty, search intent, volume, word count, SERP features, and included/excluded words. It also automatically groups related keywords into topical subgroups. Semrush Semrush

A useful workflow would be:

1. Enter your seed keyword.
2. Set Intent = informational / commercial / transactional, depending on what you want.
3. Set KD ≤ 30 (or lower if your site is new).
4. Set a minimum search volume appropriate to your niche.
5. Filter by word count ≥ 4–5 to bias toward long-tail terms.
6. Look at the SERPs for the remaining keywords before creating content.

Semrush specifically recommends looking for long-tail variants and filtering by low KD to uncover easier opportunities. Semrush

Ahrefs is arguably better for serious SEO research

Ahrefs Keywords Explorer has an enormous keyword database and lets you filter by search intent, keyword difficulty, traffic potential, volume, etc. Its intent classification includes informational, navigational, commercial, and transactional intent. Ahrefs Help Center Ahrefs

The big advantage is its SERP analysis and Traffic Potential. Ahrefs' KD is primarily based on the backlink strength of the top-ranking pages, so you can use it to identify queries where the competition's link profiles are relatively weak. Ahrefs Help Center

LowFruits is worth considering if you're specifically hunting "easy wins"

If your objective isn't just low KD, but keywords where weak websites are already ranking, I'd add LowFruits to the stack. That's a different and often more useful concept than relying on a generic 0–100 difficulty score.

For example, rather than simply saying:

“Keyword has KD 18, therefore it's easy.”

you want to ask:

“Are there several low-authority sites ranking on page one?”

That's often a much stronger indication of an opportunity.

What I'd use depending on your situation

• New/small website: Semrush + LowFruits
• Established SEO site: Ahrefs
• Agency/content team: Semrush
• Simple/cheap keyword research: KWFinder
• Maximum opportunity hunting: Ahrefs + LowFruits

One important caveat: don't treat keyword difficulty as an absolute measure of ranking difficulty. Different tools calculate it differently. Ahrefs' KD, for example, is heavily backlink-based, while actual ranking difficulty also depends on content quality, topical authority, search intent, SERP features, brand strength, and the quality of the current results. Ahrefs Help Center

If you tell me your niche/site and roughly how authoritative the site is, I can also give you a specific filter recipe (e.g. KD < 20 + 4+ words + commercial intent + 100+ searches/month) for finding long-tail opportunities.

If your objective isn't just low KD, but keywords where weak websites are already ranking, I'd add LowFruits to the stack. That's a different and often more useful concept than relying on a generic 0–100 difficulty score.

For example, rather than simply saying:

“Keyword has KD 18, therefore it's easy.”

you want to ask:

“Are there several low-authority sites ranking on page one?”

That's often a much stronger indication of an opportunity.

What I'd use depending on your situation

• New/small website: Semrush + LowFruits
• Established SEO site: Ahrefs
• Agency/content team: Semrush
• Simple/cheap keyword research: KWFinder
• Maximum opportunity hunting: Ahrefs + LowFruits

One important caveat: don't treat keyword difficulty as an absolute measure of ranking difficulty. Different tools calculate it differently. Ahrefs' KD, for example, is heavily backlink-based, while actual ranking difficulty also depends on content quality, topical authority, search intent, SERP features, brand strength, and the quality of the current results.

For discovering long-tail keyword opportunities and filtering by search intent + ranking difficulty, you’ll want tools that do more than generate keyword lists. The strongest workflows combine:

1. Keyword expansion (find thousands of variations)
2. Intent classification (informational, commercial, transactional, navigational)
3. Difficulty scoring (how hard it is to rank)
4. SERP analysis (who currently ranks and why)

Here are the best options:

Techcognate ConsumerCat## My recommendations by use case

Best overall: Semrush

Use this if you want one platform to go from idea → keyword list → content plan.

Useful features:

• Keyword Magic Tool for long-tail variations
• Intent labels (informational, commercial, transactional, etc.)
• KD% difficulty scores
• Filters like: - Include questions
• KD below a threshold
• Volume range
• Intent type

Example workflow:

• Seed keyword: "email marketing"
• Filter: - Intent: Commercial + Informational
• KD: <40
• Volume: 100–1,000/month
• Include: "best", "how", "vs", "for small business"

Semrush Semrush### Best for finding "hidden gems": LowFruits

LowFruits is built around finding keywords where the current SERP has weak competitors.

Good filters:

• Low domain authority competitors ranking
• Weak websites in top 10
• Long-tail phrases
• Question keywords

This is especially useful for:

• New websites
• Niche sites
• Affiliate sites
• Small businesses competing against larger domains

Techcognate### Best for advanced SEO teams: Ahrefs

Ahrefs is strong when you want to validate whether a keyword is actually worth pursuing.

Useful features:

• Parent topic discovery
• Keyword difficulty
• SERP overview
• Competitor keyword mining
• Traffic potential estimates

A common workflow:

1. Enter competitor URL
2. Export keywords they rank for
3. Filter: - Position: 5–30
4. Volume: low-to-medium
5. Difficulty: achievable
6. Create better content targeting those terms

Ahrefs### Best budget option: KWFinder

If you don't need a huge SEO suite:

• Easy interface
• Good difficulty scores
• Good for bloggers and small sites
• Faster learning curve

ConsumerCat## Free/cheap stack that works surprisingly well

If you’re starting out:

1. ads.google.com

• Generate keyword ideas
• Check broad demand
• search.google.com

• Find keywords you already rank for
• Identify pages sitting in positions 5–20
• answerthepublic.com

• Discover question-based long tails
• Validate final targets with a paid tool if possible.

A practical filtering formula

For many sites, a good starting filter is:

• Search volume: 50–1,000/month
• Keyword difficulty: <40
• Intent: - Blog/content sites → Informational
• SaaS/services → Commercial + Transactional
• Ecommerce → Transactional
• SERP check: - At least 2–3 weaker pages ranking
• Search results match the type of content you can create

The tool I’d pick depends mostly on your situation:

• New website: LowFruits + KWFinder
• SEO professional: Ahrefs or Semrush
• Content marketing team: Semrush + Keyword Insights
• Budget-conscious: Google tools + KWFinder

Techcognate ConsumerCat

Yes. If your goal is specifically “find long-tail keywords → filter by search intent → filter by ranking difficulty”, these are the strongest options:

My top pick: Semrush

semrush.com is probably the closest match to what you're describing.

You can start with a seed keyword and then filter by:

• Word count — e.g. 4+ words to isolate long-tail terms
• Keyword Difficulty (KD) — e.g. under 30
• Search intent — informational, commercial, navigational, transactional
• Search volume
• CPC
• SERP features
• Include/exclude words

It also automatically groups keywords into topical subgroups, which is useful for discovering clusters rather than just individual keywords. Semrush Semrush

Semrush also has Personal Keyword Difficulty, which attempts to assess difficulty specifically relative to your domain rather than treating every site the same. Semrush

Ahrefs is the other one I'd seriously consider

ahrefs.com is excellent if you want to go deeper into SERPs and competitor research.

Its particularly useful metrics include Keyword Difficulty, search volume, Traffic Potential, and Parent Topic. Ahrefs

Ahrefs also lets you filter keywords by search intent—including informational, commercial, transactional, and navigational intent. Ahrefs Help Center

LowFruits is interesting for a different reason

If your real objective is “find keywords where I actually have a chance of ranking”, I'd look at LowFruits.

Instead of relying solely on a generic KD number, its approach emphasizes finding SERPs where weaker sites are already ranking. That's often more actionable than simply finding a keyword with a KD of 20.

A workflow I'd use

For example, suppose your niche is home coffee equipment.

I'd do:

1. Enter espresso machine into Semrush.
2. Set word count ≥ 4.
3. Set KD ≤ 30.
4. Filter to commercial + informational intent.
5. Remove irrelevant/branded terms.
6. Sort by search volume.
7. Examine the SERPs for the remaining keywords.
8. Group closely related terms into one content topic/page, rather than creating a separate page for every variation.

Semrush itself recommends combining word-count and KD filters for long-tail discovery. Semrush

One important caveat: don't blindly trust a KD score. A keyword with KD 15 can still be difficult if the SERP is dominated by extremely authoritative sites, while a KD 30 keyword can sometimes be very attainable. Look at the actual top 10.

If I were choosing:

• One tool: Semrush
• Best deep SEO research: Ahrefs
• Best for finding genuinely weak/low-competition SERPs: LowFruits
• Best simple option: KWFinder
• Free starting point: Semrush's free keyword tool + Google Search Console

If you tell me your website/niche and roughly how authoritative the site is, I can also give you a concrete filter recipe (volume, KD, intent, word count, SERP characteristics) for finding long-tail opportunities that are actually realistic to rank for.

Ahrefs also lets you filter keywords by search intent—including informational, commercial, transactional, and navigational intent. help.ahrefs.com

LowFruits is interesting for a different reason

If your real objective is “find keywords where I actually have a chance of ranking”, I'd look at LowFruits.

Instead of relying solely on a generic KD number, its approach emphasizes finding SERPs where weaker sites are already ranking. That's often more actionable than simply finding a keyword with a KD of 20.

A workflow I'd use

For example, suppose your niche is home coffee equipment.

I'd do:

If your goal is specifically finding long-tail keywords and then filtering them by search intent + ranking difficulty, these are the strongest options:

1. Semrush — my pick for your use case

semrush.com is probably the closest match to what you're describing.

You can enter a broad seed term and generate huge numbers of related queries, then filter by:

• Search intent — informational, navigational, commercial, transactional
• Keyword difficulty
• Search volume
• Word count
• CPC
• SERP features
• Include/exclude words

It also automatically organizes keywords into increasingly specific subgroups, which is particularly useful for uncovering long-tail variations. Semrush Semrush

A particularly useful feature is Personal Keyword Difficulty, which estimates difficulty for your particular domain, rather than treating every site as equally competitive. Semrush

Best workflow:
Seed keyword → long-tail variations → intent = commercial/informational → KD < 30 → sort by volume/traffic potential

2. Ahrefs — best if you want deeper SERP analysis

ahrefs.com is excellent if you care about understanding why a keyword is difficult, not just getting a difficulty number.

It provides keyword suggestions, search volume, KD, traffic potential, parent topics, SERP analysis, and search-intent information. Ahrefs

You can also filter keyword lists by search intent and other attributes. Ahrefs Help Center

Its Matching terms, Related terms, and Search suggestions reports are especially useful for expanding a seed keyword into long-tail opportunities. Ahrefs Help Center

One caveat: Ahrefs' KD is primarily based on the backlink strength of the top-ranking pages, so I'd still manually inspect the SERP before deciding that a keyword is actually easy. Ahrefs Help Center

3. LowFruits — excellent for finding actually winnable long tails

If you're working on a newer or lower-authority website, I'd seriously consider adding LowFruits.

The key distinction is that instead of simply saying "KD = 18," the tool focuses on identifying SERPs where weak sites are already ranking. That's often more actionable than a generic difficulty score.

4. KWFinder — simpler alternative

Mangools KWFinder is worth considering if Semrush/Ahrefs feel like overkill. It's easier to navigate and particularly good for straightforward keyword discovery and difficulty analysis.

What I'd choose

• One tool only: Semrush
• Serious SEO research: Ahrefs
• New site / low authority: Semrush + LowFruits
• Budget-conscious: KWFinder
• Free starting point: Google Keyword Planner + manual SERP analysis

One important point: don't filter solely by "low KD." A keyword with KD 10 can still be a terrible opportunity if the SERP is dominated by huge brands, Reddit, marketplaces, or pages that perfectly satisfy the intent. Conversely, a KD 30 keyword can be very attractive if several weak sites are ranking.

If you tell me your niche/site topic and roughly how authoritative the site is, I can give you a concrete filtering recipe (e.g. KD ≤ 25 + volume ≥ 50 + commercial intent + 4+ weak competitors) that you can plug directly into Semrush/Ahrefs.

It provides keyword suggestions, search volume, KD, traffic potential, parent topics, SERP analysis, and search-intent information. Ahrefs

You can also filter keyword lists by search intent and other attributes. Ahrefs Help Center

Its Matching terms, Related terms, and Search suggestions reports are especially useful for expanding a seed keyword into long-tail opportunities. Ahrefs Help Center

One caveat: Ahrefs' KD is primarily based on the backlink strength of the top-ranking pages, so I'd still manually inspect the SERP before deciding that a keyword is actually easy. Ahrefs Help Center

3. LowFruits — excellent for finding actually winnable long tails

If you're working on a newer or lower-authority website, I'd seriously consider adding LowFruits.

The key distinction is that instead of simply saying "KD = 18," the tool focuses on identifying SERPs where weak sites are already ranking. That's often more actionable than a generic difficulty score.

4. KWFinder — simpler alternative

Mangools KWFinder is worth considering if Semrush/Ahrefs feel like overkill. It's easier to navigate and particularly good for straightforward keyword discovery and difficulty analysis.

What I'd choose

• One tool only: Semrush
• Serious SEO research: Ahrefs
• New site / low authority: Semrush + LowFruits
• Budget-conscious: KWFinder
• Free starting point: Google Keyword Planner + manual SERP analysis

One important point: don't filter solely by "low KD." A keyword with KD 10 can still be a terrible opportunity if the SERP is dominated by huge brands, Reddit, marketplaces, or pages that perfectly satisfy the intent. Conversely, a KD 30 keyword can be very attractive if several weak sites are ranking.

If you tell me your niche/site topic and roughly how authoritative the site is, I can give you a concrete filtering recipe (e.g. KD ≤ 25 + volume ≥ 50 + commercial intent + 4+ weak competitors) that you can plug directly into Semrush/Ahrefs.

If your goal is specifically “find lots of long-tail keywords, then filter them by search intent + ranking difficulty,” I’d shortlist these:

1. semrush.com — my default recommendation

This is probably the closest match to exactly what you're asking for. You can generate large keyword lists and filter them by:

• Keyword difficulty
• Search intent — informational, commercial, navigational, transactional
• Search volume
• Word count
• CPC
• SERP features
• Included/excluded words

It also automatically groups keywords into topical subgroups, which makes it particularly useful for turning a giant long-tail list into content clusters. Semrush Semrush

A useful workflow would be:

Seed keyword → long-tail variations → KD ≤ 30 → commercial/informational intent → sort by volume → manually inspect SERPs.

Semrush also has Personal Keyword Difficulty, which attempts to account for your particular domain rather than giving you only a generic difficulty score. Semrush

2. ahrefs.com — best if you care about SERP competitiveness

Ahrefs is excellent if you want to go beyond a single difficulty number.

Keywords Explorer lets you generate thousands of suggestions, filter by intent, volume, KD, traffic potential, clicks, etc., and examine the actual SERPs. Ahrefs Ahrefs Help Center

Its KD metric is based primarily on the referring domains/backlinks of the top-ranking pages, so it's particularly useful for answering:

“How many links might I need to compete here?”

Ahrefs also lets you filter for informational, navigational, commercial, and transactional intent. Ahrefs Help Center Ahrefs Help Center

I'd choose Ahrefs over Semrush if backlink/SERP analysis is especially important to you.

3. LowFruits — best for finding weak SERPs

If your real objective is “show me long-tail keywords where I actually have a shot at ranking,” LowFruits is worth looking at.

Its approach is less about simply saying KD = 18 and more about identifying weak sites/pages already ranking in the SERP. That's often more useful for smaller websites because a keyword can have a deceptively low/high numerical difficulty while the actual SERP is much easier or harder.

A recent 2026 comparison also specifically rated LowFruits as the strongest option for finding winnable long-tail keywords. Techcognate

4. Mangools KWFinder — easiest to use

If Semrush/Ahrefs feel like overkill, KWFinder is a good lightweight alternative. It's particularly appealing for bloggers, small businesses, and people who don't need a huge all-in-one SEO platform.

I'd pick it when simplicity matters more than maximum keyword/SERP data.

What I'd use

If you're building an SEO strategy from scratch:

Best overall: Semrush
Best SEO/SERP analysis: Ahrefs
Best for low-competition long tails: LowFruits
Best simple/cheaper option: KWFinder

One important caveat: don't filter solely on KD. A keyword with KD 15 isn't automatically easier than one with KD 25. Look at the actual first page—especially whether small/low-authority sites are ranking, whether the results actually satisfy the search intent, and whether the SERP is dominated by huge authoritative domains.

If you tell me your website/niche and roughly how authoritative the site is, I can also give you a concrete filtering recipe (e.g. volume ≥ 50, KD ≤ 25, commercial intent, 4+ words) for finding long-tail opportunities.

If your main goal is finding long-tail keywords and filtering them by both search intent and ranking difficulty, I’d shortlist these:

1. Semrush — my pick for your use case

semrush.com

This is probably the closest match to exactly what you're asking for. You can start with a seed keyword, then filter the resulting keywords by:

• Keyword Difficulty
• Search intent — informational, navigational, commercial, transactional
• Search volume
• Word count
• SERP features
• Include/exclude terms

It also automatically groups keywords into topical subgroups, which makes it particularly useful for turning a giant list of long-tails into content clusters. Semrush Semrush

A useful workflow would be:

Seed keyword → Word count ≥4 → KD low → Intent = informational/commercial → sort by volume

Semrush specifically recommends using word-count and KD filters to surface long-tail opportunities. Semrush

2. Ahrefs — excellent if you care about SERP competitiveness

ahrefs.com

Ahrefs is arguably better when your question is "Can I actually rank for this?"

You get keyword difficulty, search volume, traffic potential, parent topics, SERP analysis, and keyword clustering. Its intent filter lets you bulk-filter keywords by informational, navigational, commercial, and transactional intent. Ahrefs Help Center Ahrefs

Its KD metric is primarily based on the referring domains/backlinks of the top-ranking pages, so I'd use it alongside an actual SERP inspection rather than treating KD as an absolute ranking prediction. Ahrefs Help Center

3. LowFruits — particularly interesting for low-competition long-tails

If you're building a smaller site and don't have much authority yet, I'd seriously consider LowFruits.

Its core appeal is identifying keyword SERPs where weak/low-authority sites are already ranking. That's often more actionable than simply finding keywords with a low numerical KD score.

What I'd choose

• One tool: Semrush
• Maximum SEO research depth: Ahrefs
• New/small site trying to find easy wins: LowFruits
• Lower-cost/simple interface: KWFinder

One important distinction: "long-tail" doesn't automatically mean "easy." A four-word keyword can still have extremely strong competition. I'd prioritize keywords where intent is clearly aligned with your content + difficulty is low + the current SERP contains relatively weak pages.

If you tell me what niche/site you're doing keyword research for, I can also give you a specific filter recipe (e.g. KD < 20, 4+ words, commercial intent, 50+ searches/month) and explain which tool will find the most opportunities.

ahrefs.com

Ahrefs is arguably better when your question is "Can I actually rank for this?"

You get keyword difficulty, search volume, traffic potential, parent topics, SERP analysis, and keyword clustering. Its intent filter lets you bulk-filter keywords by informational, navigational, commercial, and transactional intent. help.ahrefs.com ahrefs.com

Its KD metric is primarily based on the referring domains/backlinks of the top-ranking pages, so I'd use it alongside an actual SERP inspection rather than treating KD as an absolute ranking prediction.

3. LowFruits — particularly interesting for low-competition long-tails

If you're building a smaller site and don't have much authority yet, I'd seriously consider LowFruits.

If your main requirement is “find lots of long-tail keywords, then filter by search intent + ranking difficulty”, I’d shortlist these:

1. semrush.com — my top pick

This is probably the closest match to what you're asking for. You can start with a seed keyword and get a huge set of related queries, then filter by keyword difficulty, search intent, volume, word count, questions, SERP features, and include/exclude terms. Semrush says its database contains more than 27 billion keywords. Semrush Semrush

A useful workflow would be:

• Enter your broad topic.
• Filter Intent → informational/commercial/transactional.
• Set KD → low.
• Set a minimum search volume.
• Filter by word count to surface longer queries.
• Look for questions and specific modifiers.
• Export the winners into content clusters.

Semrush also has Personal Keyword Difficulty, which attempts to estimate difficulty specifically for your domain rather than using only a generic difficulty score. Semrush

2. ahrefs.com — excellent alternative

Ahrefs is particularly strong if you want to combine long-tail discovery with competitor analysis and SERP analysis.

Its Keywords Explorer lets you generate thousands of ideas, filter by KD and other metrics, and specifically filter keywords by informational, navigational, commercial, and transactional intent. Ahrefs Help Center Ahrefs

Its Matching terms, Related terms, and Questions reports are especially useful for finding long-tail variations. Ahrefs Help Center

One thing I like about Ahrefs is Traffic Potential. A keyword might have only 100 searches/month but the page ranking for it could receive thousands of visits from related queries. Ahrefs

3. LowFruits — worth considering if you're specifically hunting for easy wins

I'd consider this if your priority isn't simply finding keywords, but finding keywords where relatively weak websites are already ranking.

That's often more useful than blindly saying “KD < 20,” because third-party difficulty scores are estimates. The actual SERP can tell you much more.

What I'd choose

If you want one tool: Semrush.

If you're doing serious SEO/content research: Ahrefs or Semrush.

If you have a newer/smaller site and your primary goal is finding low-competition opportunities: I'd pair Ahrefs/Semrush with LowFruits.

And don't treat KD as the final decision. Ahrefs itself notes that KD is primarily an estimate of the backlink strength required to rank; you should still inspect the actual SERP. Ahrefs Help Center Ahrefs

A particularly effective filter is something like:

Long-tail + relevant intent + KD < 20–30 + meaningful volume + weak/mediocre current SERP competitors

That tends to produce a much better opportunity list than simply sorting by search volume.

If you tell me your niche/site and roughly how authoritative the site is, I can also recommend the best tool and give you an exact filter recipe for finding 50–100 realistic long-tail opportunities.

If your goal is specifically “find lots of long-tail keywords, then filter them by search intent + ranking difficulty,” I’d shortlist these:

1. Semrush — best match for your requirements

semrush.com

This is probably what I'd choose if you want one tool that does everything.

You can generate huge numbers of related keywords and filter by:

• Keyword Difficulty
• Search intent — informational, navigational, commercial, transactional
• Search volume
• Word count — useful for explicitly surfacing long-tail terms
• Questions
• SERP features
• CPC
• Include/exclude words
• Topic/subtopic groups

Semrush says Keyword Magic Tool has a database of 27B+ keywords and supports advanced filtering and topical grouping. Semrush Semrush

A useful workflow would be:

Seed keyword → 4+ words → KD <30 → informational/commercial intent → sort by volume

That gets you very close to a list of low-competition long-tail topics worth creating content around.

It also has Personal Keyword Difficulty, which adjusts difficulty based on your particular domain rather than treating every website equally. Semrush

2. Ahrefs — best if you care about SERP competitiveness

ahrefs.com

Ahrefs is excellent for finding long-tail opportunities and then determining whether they're actually winnable.

You can filter keyword ideas by:

• Keyword Difficulty
• Search volume
• Search intent
• Traffic potential
• Parent topic
• SERP characteristics
• Terms/questions

Its KD metric is based primarily on the referring domains/backlinks of the top-ranking pages. Ahrefs Help Center

The particularly useful feature is Traffic Potential: rather than assuming search volume tells you how much traffic a keyword can generate, Ahrefs estimates the traffic received by the current #1 page. Ahrefs

Ahrefs also lets you bulk-filter keywords by search intent. Ahrefs Help Center

3. LowFruits — particularly interesting for low-authority sites

lowfruits.io

If your primary question is:

“Which long-tail keywords can I realistically rank for?”

I'd seriously consider LowFruits.

Its differentiator is looking for weak spots in the SERPs—situations where relatively weak websites are already ranking. That's often more useful than simply saying “KD = 18.”

This makes it particularly attractive for new sites, niche sites, and smaller businesses competing against established domains.

4. KWFinder — good if you don't need a massive SEO suite

mangools.com

KWFinder is easier to learn than Semrush/Ahrefs and has a strong focus on keyword discovery and difficulty.

I'd choose it if you want something relatively straightforward rather than paying for a huge all-in-one SEO platform.

What I'd choose

For most people: Semrush

For advanced SEO: Ahrefs

For finding unusually easy long-tail opportunities: LowFruits

For a simpler/cheaper workflow: KWFinder

One important caveat: don't blindly trust a KD number. A keyword with KD 15 can still be difficult if the SERP is dominated by highly authoritative sites, while a KD 30 keyword can sometimes be surprisingly attainable. Ahrefs itself notes that its KD is primarily a backlink-based measure, so you should inspect the actual SERP before committing to a topic. Ahrefs Help Center

If you tell me what niche/site you're doing keyword research for, I can also give you a concrete filtering recipe (e.g. “4+ words + informational/commercial + KD <25 + volume 50–1,000”) and explain exactly which tool I'd use.

If you want to discover long-tail keyword opportunities and filter them by search intent + ranking difficulty, you’ll want a tool that combines:

• keyword discovery (thousands of variations)
• search intent classification (informational, commercial, transactional, navigational)
• keyword difficulty (KD/competition score)
• SERP analysis (who ranks and why)
• competitor keyword mining

Here are the strongest options:

1. Ahrefs — Best for serious SEO research

ahrefs.com

Best for: Content teams, agencies, advanced bloggers

Why it’s strong:

• Huge keyword database
• Excellent long-tail discovery through Keywords Explorer
• Filters for: - search volume
• keyword difficulty
• traffic potential
• questions
• SERP features
• Strong competitor analysis: find keywords competitors rank for but you don’t Ahrefs Ahrefs

Typical workflow:

1. Enter a seed topic (“standing desk”)
2. Open Matching Terms
3. Filter: - Volume: 10–300/month
4. KD: low difficulty
5. Intent: informational/commercial
6. Check SERPs for weak competitors

Best feature for long tails: finding “low-volume but high-value” queries where the ranking pages are weak. Ahrefs

2. Semrush — Best all-in-one option

semrush.com

Best for: SEO + content marketing teams

Strengths:

• Keyword Magic Tool generates huge keyword lists
• Intent labels: - Informational
• Navigational
• Commercial
• Transactional
• Keyword difficulty scoring
• Competitor gap analysis
• Content optimization tools Semrush Semrush

Good filters:

• Word count: 4+ words
• KD: easy/medium
• Intent: commercial or transactional
• Volume: low-to-medium

Example opportunities:

• “best ergonomic chair for tall people under 500”
• “how to fix standing desk wobble”
• “standing desk vs treadmill desk for back pain”

3. LowFruits — Best for finding easy-to-rank keywords

lowfruits.io

Best for: New websites and niche sites

Its main advantage:

• Finds keywords where weak sites already rank
• Focuses less on volume and more on ranking opportunity

Great if your goal is:

“Find keywords I can realistically rank for in 3–6 months.”

4. Mangools (KWFinder) — Best beginner-friendly tool

mangools.com

Best for: Solo bloggers and small businesses

Pros:

• Simple interface
• Keyword difficulty scores
• SERP preview
• Good long-tail suggestions

Less powerful than Ahrefs/Semrush, but much easier to learn.

5. Google Keyword Planner — Best free source

ads.google.com

Best for: Free keyword discovery

Useful for:

• seed ideas
• search volume estimates
• advertiser competition

Weakness:

• not designed for SEO difficulty analysis
• no true intent classification

A practical long-tail keyword workflow

A good stack:

Budget:

• Google Keyword Planner → find ideas
• google.com autocomplete + People Also Ask → expand
• lowfruits.io → find easy wins

Professional:

• ahrefs.com or semrush.com
• Export keywords
• Filter:

My recommendation by use case

• New website: lowfruits.io + Google Keyword Planner
• Affiliate/content site: ahrefs.com
• Business doing SEO seriously: semrush.com
• Beginner who wants simplicity: mangools.com

If your main goal is finding low-competition keywords you can actually rank for, I’d prioritize Ahrefs + LowFruits rather than chasing the highest-volume keywords.

If your main goal is finding long-tail keywords and then filtering them by search intent + ranking difficulty, I’d shortlist these:

1. Semrush — best overall

semrush.com is probably the closest match to exactly what you're describing.

You can start with a broad seed like "project management software", then:

• Discover thousands of related and long-tail terms
• Filter by keyword difficulty
• Filter by search intent: informational, navigational, commercial, transactional
• Filter by search volume
• Filter by word count to isolate longer queries
• Use "Questions" to uncover question-based long tails
• Drill into subtopics and keyword groups Semrush Semrush

It also has Personal Keyword Difficulty, which attempts to estimate difficulty specifically for your domain, rather than treating every website as equally authoritative. Semrush

My pick if you want one tool.

2. Ahrefs — best for serious SEO research

ahrefs.com is excellent if you're going beyond basic keyword discovery.

It lets you generate large numbers of keyword ideas, cluster them by topic, examine SERPs, and filter by intent. Its KD score is based primarily on the backlink strength of the top-ranking pages. Ahrefs Ahrefs Help Center

One particularly useful workflow is:

Seed → Matching terms → Questions → low KD → inspect SERP

Ahrefs specifically recommends using its Questions report and KD filters for finding long-tail opportunities, particularly for lower-authority sites. Ahrefs

3. LowFruits — best if "low competition" is your priority

If your actual objective is:

"Show me long-tail keywords where relatively weak websites are already ranking."

I'd seriously consider LowFruits.

Rather than relying exclusively on a generic difficulty number, its approach is geared toward identifying SERPs with weak competitors, which can be much more actionable when you're trying to find keywords a newer/smaller site can actually win.

4. KWFinder — best for simplicity

mangools.com is worth considering if Semrush/Ahrefs feel like overkill.

It's particularly nice for quickly finding long-tail variations and sorting them by difficulty without dealing with a huge enterprise SEO platform.

What I'd use

If I were building a long-tail keyword opportunity pipeline, I'd choose:

Semrush → filter → export → prioritize

For example:

1. Enter your broad topic.
2. Filter word count ≥ 4.
3. Filter KD ≤ 30.
4. Filter for informational + commercial intent.
5. Set a minimum volume appropriate to your niche.
6. Remove branded terms.
7. Examine the SERP for the remaining keywords.
8. Group keywords that can be answered by the same page.

That last step is important: don't create 20 pages just because you found 20 long-tail variations. The SERP often tells you whether Google considers them essentially the same search intent.

If you tell me your niche/site topic and roughly how authoritative/new the site is, I can also give you a specific filter recipe (e.g. KD, volume, word count, intent) for finding the easiest long-tail opportunities.

One particularly useful workflow is:

Seed → Matching terms → Questions → low KD → inspect SERP

Ahrefs specifically recommends using its Questions report and KD filters for finding long-tail opportunities, particularly for lower-authority sites. Ahrefs

3. LowFruits — best if "low competition" is your priority

If your actual objective is:

"Show me long-tail keywords where relatively weak websites are already ranking."

I'd seriously consider LowFruits.

Rather than relying exclusively on a generic difficulty number, its approach is geared toward identifying SERPs with weak competitors, which can be much more actionable when you're trying to find keywords a newer/smaller site can actually win.

4. KWFinder — best for simplicity

mangools.com is worth considering if Semrush/Ahrefs feel like overkill.

It's particularly nice for quickly finding long-tail variations and sorting them by difficulty without dealing with a huge enterprise SEO platform.

What I'd use

If I were building a long-tail keyword opportunity pipeline, I'd choose:

Semrush → filter → export → prioritize

For example:

1. Enter your broad topic.
2. Filter word count ≥ 4.
3. Filter KD ≤ 30.
4. Filter for informational + commercial intent.
5. Set a minimum volume appropriate to your niche.
6. Remove branded terms.
7. Examine the SERP for the remaining keywords.
8. Group keywords that can be answered by the same page.

That last step is important: don't create 20 pages just because you found 20 long-tail variations. The SERP often tells you whether Google considers them essentially the same search intent.

If you tell me your niche/site topic and roughly how authoritative/new the site is, I can also give you a specific filter recipe (e.g. KD, volume, word count, intent) for finding the easiest long-tail opportunities.

For finding long-tail keyword opportunities and filtering them by search intent + ranking difficulty, you’ll want tools that go beyond keyword volume. The best ones combine:

• Keyword expansion (thousands of variations)
• Search intent classification (informational, commercial, transactional, navigational)
• Keyword difficulty (KD/competition score)
• SERP analysis (who ranks and why)
• Competitor gap analysis

Here are the strongest options:

TechRadar BestPage## Best overall choices

1. Semrush — best if you want intent filtering

Good workflow:

1. Enter a seed keyword.
2. Open Keyword Magic Tool.
3. Filter: - Intent: Informational / Commercial / Transactional
4. KD%: e.g., under 40
5. Word count: 4+ words
6. Volume: minimum threshold you care about
7. Export opportunities.

Semrush is especially useful if you want to find keywords competitors rank for but you don’t. Its keyword tools include intent labels and difficulty metrics. Semrush Semrush

Best for:

• SaaS companies
• Affiliate sites
• Agencies
• Content teams

2. Ahrefs — best for realistic ranking opportunities

Ahrefs is excellent for identifying terms where the SERP competition is actually beatable.

Useful filters:

• Keyword Difficulty (KD)
• Parent Topic
• Traffic Potential
• Questions
• Matching Terms

A common workflow:

Seed → Questions → KD < 20 → Analyze SERP → Create content brief

Ahrefs is particularly strong because it combines keyword data with backlink and SERP analysis. Astro SEO Blog

Best for:

• SEO professionals
• Content-led businesses
• Sites trying to rank against established competitors

3. LowFruits — best for finding “easy wins”

If your goal is specifically:

“Find keywords where weak websites are already ranking”

LowFruits is designed around that idea. It helps identify low-competition queries where the top results have weaker authority.

Best for:

• New websites
• Niche sites
• Affiliate SEO

BestPage

4. Mangools KWFinder — easiest interface

Good if you don’t want an enterprise SEO platform.

Example filters:

• Keyword difficulty: Easy
• Search volume: 100–1,000/month
• Long-tail modifiers: - “best”
• “vs”
• “for beginners”
• “near me”
• “under $X”
• “how to”

Astro SEO Blog

Free stack (surprisingly effective)

If you don’t want to pay:

1. ads.google.com

• Finds variations
• Gives search estimates
• search.google.com

• Finds keywords you already appear for
• Great for “almost ranking” opportunities
• answerthepublic.com

• Finds question-based long-tail ideas

HubSpot Blog

My recommended workflow

For most content sites:

1. Start with Semrush or Ahrefs
2. Export keywords with: - 3–8 words
3. KD under 30
4. Clear intent
5. At least some search volume
6. Group by search intent:

Informational

• “how to”
• “what is”
• “guide”
• “tips”

Commercial

• “best”
• “review”
• “comparison”
• “alternative”

Transactional

• “buy”
• “pricing”
• “discount”
• “service”

1. Manually inspect the SERP: - Are forums ranking?
2. Are low-authority sites ranking?
3. Are results outdated?
4. Does search intent match your content?

A good target is usually not the keyword with the highest volume — it’s the keyword where the search intent matches your page and the current results look beatable.

If you want to find long-tail keyword opportunities and filter them by search intent + ranking difficulty, you’ll want tools that combine:

• Keyword expansion (thousands of variations)
• Search intent classification (informational, commercial, transactional, navigational)
• Keyword difficulty (KD)
• SERP analysis (who ranks and why)
• Filters for low-competition opportunities

Here are the strongest options:

Techcognate Ahrefs## My top picks by use case

Best overall: Semrush

semrush.com

Use it if you want a workflow like:

1. Enter a seed keyword
2. Generate thousands of variations
3. Filter: - Intent = Commercial/Transactional
4. KD = Easy/Medium
5. Volume = minimum threshold
6. Word count = 4+ words
7. Export content opportunities

Semrush is particularly strong because its keyword tools combine volume, difficulty, intent labels, CPC, and SERP data. Semrush

Example filters:

• Keyword: "project management software"
• Include words: "for small business", "for freelancers", "free", "template"
• KD: <40
• Intent: Commercial
• Volume: 50–1,000/month

Best for finding "low-hanging fruit": LowFruits

lowfruits.io

LowFruits is built around finding keywords where the current search results contain weak competitors. It is useful when you have a newer site and need realistic ranking opportunities rather than just high-volume keywords. Techcognate

Good filters:

• Weak domains ranking in top 10
• Low authority competitors
• Question keywords
• Long-tail phrases

Best for serious SEO teams: Ahrefs

ahrefs.com

Ahrefs is excellent for:

• Competitor keyword mining
• Finding keywords competitors rank for but you don't
• Filtering by: - KD
• traffic potential
• volume
• parent topic
• SERP features

Its Content Gap feature is especially useful for discovering overlooked long-tail opportunities. Ahrefs

A practical long-tail keyword workflow

A good process:

1. Start with a broad seed

Example:

"email marketing"

2. Expand into modifiers

Look for terms containing:

• "for"
• "best"
• "vs"
• "alternative"
• "how to"
• "without"
• "near me"
• "template"
• "pricing"
• "software"
• "beginner"

Examples:

• email marketing software for nonprofits
• best email marketing tool for photographers
• email marketing automation without a website

3. Filter aggressively

A typical long-tail filter:

• Word count: 4+ words
• KD: under 30–40
• Search intent: commercial or transactional
• Volume: 20–1,000/month
• SERP: avoid pages dominated by huge brands

4. Validate the SERP manually

A keyword with low KD can still be hard if Google only shows:

• Wikipedia
• Amazon
• major publishers
• government sites
• established SaaS companies

Budget-friendly stack

If you don't want a large monthly subscription:

• ads.google.com — free keyword ideas
• search.google.com — find keywords you already rank for
• answerthepublic.com — question-based long tails
• LowFruits — occasional paid credits for finding easy wins

For most content sites, I’d choose:

1. New website: LowFruits + Google Search Console
2. Affiliate/content site: Ahrefs or Semrush
3. SaaS/company blog: Semrush (intent filtering is especially useful)
4. Tight budget: Google tools + KWFinder/LowFruits credits

The key is not finding the largest keyword list—it’s finding keywords where the search intent matches your page and the current SERP is weak enough that you can realistically compete.

If your goal is specifically “find long-tail keywords → filter by search intent → filter by ranking difficulty”, I’d shortlist these:

1. Semrush — best overall

semrush.com

This is probably the closest match to what you're describing. Keyword Magic Tool lets you filter simultaneously by keyword difficulty, search intent, volume, word count, SERP features, CPC, and include/exclude terms. It also automatically groups keywords into topical subgroups, making it easy to drill from a broad seed into very specific long-tail variations. Semrush Semrush

For example, you could start with:

project management software

Then filter roughly:

• Intent: Commercial
• KD: 0–30
• Word count: 4+
• Volume: 10+
• Include: for small business

That gives you a much more actionable list than simply sorting by search volume.

2. Ahrefs — best for deeper SEO analysis

ahrefs.com

Ahrefs is excellent if you care about whether you can realistically rank, rather than just finding keywords with low numerical difficulty.

It provides keyword ideas, KD, search volume, Traffic Potential, Parent Topic, SERP analysis, and search-intent classification. You can also filter intent in bulk. Ahrefs Help Center Ahrefs

One particularly useful feature is finding keywords where weak sites are already ranking. That's often a better opportunity signal than KD alone. Ahrefs

3. LowFruits — best if your priority is easy wins

LowFruits is worth looking at if your actual goal is:

“Show me long-tail keywords where relatively weak websites are already ranking.”

That's a different—and often more useful—question than simply asking for keywords with KD < 30.

I'd particularly consider it for a newer/smaller site where you want to build traffic through lots of attainable long-tail topics.

4. KWFinder — best if you don't need a huge SEO suite

mangools.com

KWFinder has a much simpler interface than Semrush/Ahrefs and is good for quickly finding long-tail variations and checking difficulty. It's a reasonable choice if you don't need the enormous databases and additional SEO tools that come with the larger platforms.

What I'd choose

If you want one tool: Semrush.

If you're doing sophisticated SEO research: Ahrefs.

If you're specifically hunting for low-competition long-tail opportunities: LowFruits + Ahrefs/Semrush is a particularly strong combination.

And I wouldn't use KD alone as your difficulty filter. Both Ahrefs and Semrush emphasize that their difficulty scores are estimates; you should ultimately inspect the SERP and the sites currently ranking. Ahrefs, for example, bases its standard KD primarily on referring domains to top-ranking pages. Ahrefs

A very effective workflow is:

Seed keyword → long-tail expansion → intent filter → low KD → weak-SERP/low-authority filter → manually inspect SERP → cluster into pages.

If you tell me what niche/site you're doing this for, I can also give you a concrete filter recipe (e.g. KD < 25 + commercial intent + 4–8 words + minimum volume) and explain which tool will find the most opportunities.

Yes. If your main goal is finding long-tail keywords, then filtering them by search intent + ranking difficulty, I’d shortlist these:

1. semrush.com — best fit

This is probably the closest match to exactly what you're asking for.

You can start with a seed keyword and then filter by:

• Search intent — informational, commercial, transactional, navigational
• Keyword Difficulty (KD)
• Search volume
• Word count — useful for explicitly finding 4+ word long-tails
• Questions
• SERP features
• Include/exclude terms

Semrush also has Personal Keyword Difficulty (PKD), which attempts to estimate difficulty specifically for your domain, rather than giving you only a generic difficulty score. Semrush Semrush

For example, you could essentially build a filter like:

4+ words + informational intent + KD <30 + volume >50

That makes it very good for systematically finding low-competition content opportunities. Semrush Semrush

2. ahrefs.com — best for deeper analysis

Ahrefs is excellent if you care about whether the SERP is actually beatable, rather than relying solely on a difficulty number.

It provides:

• Huge keyword database
• Keyword Difficulty
• Search volume
• Search intent
• Traffic Potential
• SERP analysis
• Parent Topic
• Questions
• Keyword clustering
• Competitor/content gap research

Its KD metric is based primarily on the backlinks pointing to the top-ranking pages, while its SERP analysis lets you inspect the actual competitors. Ahrefs Ahrefs

I particularly like Ahrefs for long-tails because you can use Matching Terms → volume/KD filters → Questions, then inspect the SERP to see whether weak sites are already ranking. Ahrefs

3. LowFruits — best if your priority is easy wins

If your real question is:

"Which long-tail keywords can a relatively small site actually rank for?"

I'd seriously consider LowFruits.

Its approach is less about finding enormous keyword volumes and more about identifying weak competition in the SERPs. That's particularly useful for niche sites, affiliate sites, and newer domains.

My recommendation

If you're starting from scratch, I'd choose:

Semrush → discover and filter → Ahrefs → validate the SERP

For example:

1. Enter project management software.
2. Find thousands of related terms.
3. Filter to 4+ words.
4. Filter to informational or commercial intent.
5. Set KD ≤ 30.
6. Set a reasonable minimum volume.
7. Group related keywords into topics.
8. Check the SERP for your best candidates.
9. Prioritize keywords where the current results contain weak/small sites, poorly matched content, forums, outdated pages, or low-authority domains.

The important part is not to treat KD as gospel. A keyword with KD 20 can still be difficult if the SERP is dominated by exceptionally relevant, authoritative pages; conversely, a higher-KD keyword can sometimes be attainable if the existing results are weak.

If I had to pick just one for your specific use case: Semrush. Its combination of long-tail discovery, intent filters, word-count filters, KD, and domain-specific difficulty is unusually well suited to this workflow. Semrush Semrush

If you tell me your website/niche and roughly how authoritative the site is, I can also give you a specific filtering recipe (e.g. volume ≥ 50, KD ≤ 25, 4+ words, commercial intent) for finding the easiest opportunities.

Its approach is less about finding enormous keyword volumes and more about identifying weak competition in the SERPs. That's particularly useful for niche sites, affiliate sites, and newer domains.

My recommendation

If you're starting from scratch, I'd choose:

If your goal is specifically to find long-tail keyword opportunities and filter them by search intent + ranking difficulty, you’ll want a tool that does more than generate keyword lists. Look for:

• Keyword expansion (questions, variations, related terms)
• Search intent classification (informational, commercial, transactional, navigational)
• Keyword difficulty (KD) scoring
• SERP analysis (who ranks, domain strength, content gaps)
• Filters for volume, CPC, words, intent, and difficulty

Here are the strongest options:

TechRadar Techcognate## Best picks by use case

Best overall: Semrush

Use it if you’re building a serious content strategy.

Good workflow:

1. Enter a broad seed keyword.
2. Open Keyword Magic Tool.
3. Filter: - Intent → Informational / Commercial / Transactional
4. KD → e.g., under 30–40
5. Volume → e.g., 50–5,000/month
6. Word count → 4+ words for long-tail
7. Export keyword clusters.

Semrush is especially strong when you want to combine keyword research with competitor gap analysis. Zapier

Best for finding “hidden” easy wins: LowFruits

This is designed around finding keywords where the current SERP has weak competitors.

Look for:

• Low authority domains ranking
• Forums/Q&A sites ranking
• Thin content ranking
• Low difficulty long-tail phrases

It’s useful for niche sites, affiliate sites, and newer domains. Techcognate

Best budget option: Mangools KWFinder

Good if you don’t want an expensive SEO suite.

Useful filters:

• Keyword difficulty
• Search volume
• Trends
• SERP overview
• Questions and related keywords

It’s easier to learn than enterprise tools. Zapier

Best for advanced SEO teams: Ahrefs

Strong choice if you care about:

• Competitor keywords
• Backlink strength
• Traffic potential
• SERP analysis

A common workflow is:

1. Find competitors ranking for topics you want.
2. Extract their keywords.
3. Filter by KD and traffic potential.
4. Build better pages around gaps.

App SEO -

A practical filter setup for finding long-tail opportunities

Try this starting point:

Informational content

• Search volume: 50–1,000/month
• Keyword difficulty: <30
• Words: 4+
• Intent: Informational

Example:

• Too broad: running shoes
• Better: best running shoes for flat feet beginners

Commercial content

• Search volume: 20–500/month
• Difficulty: <35
• Intent: Commercial investigation

Example:

• Too broad: CRM software
• Better: best CRM software for real estate teams

High-conversion pages
Look for modifiers:

• “best”
• “vs”
• “alternative”
• “for [audience]”
• “under $X”
• “near me”
• “how to”
• “template”
• “checklist”

My recommended stack

Beginner / solo blogger

• KWFinder + Google Search Console

Niche site / affiliate SEO

• LowFruits + Ahrefs

Agency / professional SEO

• Semrush + Ahrefs

Free workflow

• Google Keyword Planner + Google Search suggestions + Google Search Console

(then manually validate difficulty by checking the SERP)

Zapier gatilab.comIf you tell me your niche, website age/domain authority, and whether you’re targeting blog traffic, leads, or sales, I can suggest the exact filters and workflow to use.

If you want to find long-tail keyword opportunities and filter them by search intent + ranking difficulty, these are the strongest options:

Semrush Ahrefs mangools Ranklogs## Best overall choices

1. Semrush — best if you want filtering by intent + difficulty

Good workflow:

1. Enter a seed keyword.
2. Generate thousands of variations.
3. Filter: - Keyword Difficulty (KD)
4. Search intent (informational, commercial, transactional, navigational)
5. Search volume
6. Word count
7. SERP features

Its Keyword Magic Tool is designed specifically for expanding topics into related and long-tail keywords while filtering by metrics like intent and difficulty. Semrush

Best for:

• Content teams
• Agencies
• Sites publishing at scale
• Finding “low competition, high buyer intent” terms

2. Ahrefs — best for competitor keyword gaps

Ahrefs is especially strong when you want to discover:

• Keywords competitors rank for
• Long-tail terms driving traffic to specific pages
• Low-difficulty opportunities

Its Keyword Difficulty metric estimates how hard it is to rank based on competing pages and backlink strength. Ahrefs

Best workflow:

• Put a competitor URL into Site Explorer
• Export keywords
• Filter: - KD < 30
• Position 5–20 (easy wins)
• Long queries (4+ words)
• Commercial intent modifiers (“best,” “vs,” “for,” “near me,” “price”)

3. Mangools KWFinder — best budget option

KWFinder is a good middle ground if you do not need an enterprise SEO suite. It provides:

• Long-tail keyword suggestions
• Search volume
• CPC
• Keyword difficulty
• SERP analysis
• Search intent indicators mangools

Good for:

• Bloggers
• Small businesses
• Niche sites

4. KeywordTool.io — best for raw long-tail ideas

If your problem is “I need hundreds of ways people phrase this search,” autocomplete-based tools are useful.

Example seed:

“standing desk”

You might uncover:

• “best standing desk for tall people with back pain”
• “standing desk under $300 for home office”
• “standing desk converter vs full desk”

Then you can validate those ideas in Semrush, Ahrefs, or KWFinder.

A practical filtering system

After exporting keywords, I’d usually filter like this:

Low-competition informational opportunities

• Difficulty: 0–30
• Words: 4+
• Intent: Informational
• Examples: - “how to…”
• “why does…”
• “best way to…”

High-value commercial opportunities

• Difficulty: 0–40
• Intent: Commercial investigation
• Examples: - “best X for Y”
• “X alternatives”
• “X vs Y”
• “X reviews”

Buyer-ready keywords

• Difficulty: 0–50
• Intent: Transactional
• Examples: - “buy X”
• “X pricing”
• “X near me”
• “hire X”

My recommended stack by budget

Free:

• Google Keyword Planner
• Google Search Console
• KeywordTool.io free tier
• SERP analysis manually

Around $30–50/month:

• KWFinder/Mangools
• A small Semrush or Ahrefs plan if available

Professional SEO:

• Semrush + Ahrefs combination

For most content sites, a strong workflow is:
KeywordTool.io → Semrush/Ahrefs validation → Google Search Console feedback loop.

If your main goal is finding long-tail keywords and then filtering them by both search intent and ranking difficulty, these are the strongest options:

My top pick: Semrush

Semrush is probably the closest match to exactly what you're describing.

Its Keyword Magic Tool lets you start with a seed keyword and generate huge numbers of related terms, including very specific long-tail variations. You can filter by:

• Keyword length/word count — useful for isolating long-tail queries
• Keyword Difficulty (KD)
• Search intent — informational, navigational, commercial, transactional
• Search volume
• CPC
• SERP features
• Included/excluded words

It also automatically groups keywords into topic/subtopic clusters. Semrush Semrush

For example, you could start with:

project management software

and filter toward something like:

4+ words → KD < 30 → Commercial intent → volume > 50

That gets you much closer to "keywords I can realistically rank for that also have buying intent" rather than just a giant list of keyword suggestions.

Ahrefs is the other one I'd seriously consider

Ahrefs Keywords Explorer is particularly good if you want to investigate why a keyword is difficult.

It can generate matching terms, related terms, search suggestions and question keywords, while providing KD, search volume, traffic potential and SERP data. Ahrefs Ahrefs Help Center

Ahrefs also added bulk search-intent filtering for informational, navigational, commercial and transactional intent. Ahrefs Help Center

One important distinction: Ahrefs' KD is primarily an estimate of the backlink strength needed to compete with the current top results, so I wouldn't treat it as an absolute ranking probability. Ahrefs Help Center

LowFruits is worth looking at for a different reason

LowFruits is built around finding low-competition SERPs, rather than simply giving you a big keyword database. Its core premise is identifying signals that suggest a topic is easier to rank for. Low Fruits

I'd consider it if you're working on a new/small site where "KD 25" isn't necessarily enough—you want to identify SERPs where relatively weak sites are already ranking.

What I'd use

• One tool: Semrush
• Best deep-research workflow: Ahrefs
• New/small site looking for easy wins: LowFruits
• Budget-conscious all-in-one SEO platform: SE Ranking

One caveat: don't rely solely on the difficulty number. A keyword with KD 15 can still be difficult if the SERP is dominated by highly authoritative sites, while a KD 30 keyword can sometimes be surprisingly attainable. Ahrefs itself recommends using KD as an initial filter and then analyzing the actual SERP. Ahrefs

If you tell me your niche/site and whether it's new or established, I can also give you a specific filter recipe (e.g. word count + volume + KD + intent + SERP conditions) for finding the best long-tail opportunities.

That gets you much closer to "keywords I can realistically rank for that also have buying intent" rather than just a giant list of keyword suggestions.

Ahrefs is the other one I'd seriously consider

Ahrefs Keywords Explorer is particularly good if you want to investigate why a keyword is difficult.

It can generate matching terms, related terms, search suggestions and question keywords, while providing KD, search volume, traffic potential and SERP data. Ahrefs Ahrefs Help Center

Ahrefs also added bulk search-intent filtering for informational, navigational, commercial and transactional intent. Ahrefs Help Center

One important distinction: Ahrefs' KD is primarily an estimate of the backlink strength needed to compete with the current top results, so I wouldn't treat it as an absolute ranking probability. Ahrefs Help Center

LowFruits is worth looking at for a different reason

LowFruits is built around finding low-competition SERPs, rather than simply giving you a big keyword database. Its core premise is identifying signals that suggest a topic is easier to rank for.

I'd consider it if you're working on a new/small site where "KD 25" isn't necessarily enough—you want to identify SERPs where relatively weak sites are already ranking.

What I'd use

If your goal is to discover long-tail keyword opportunities and filter them by search intent + ranking difficulty, you’ll want a tool that does more than just generate keyword ideas. The best options combine:

• Keyword expansion (thousands of related phrases)
• Search intent classification (informational, commercial, transactional, navigational)
• Keyword difficulty (KD)
• SERP analysis (who ranks and why)
• Filtering/exporting for content planning

Here are the strongest choices:

Technova Partners BestPage## Best overall: Ahrefs Keywords Explorer

Use it if you want to find keywords like:

• “best crm for small construction companies”
• “how to fix wordpress checkout errors”
• “accounting software for freelance designers”

Useful filters:

• Keyword Difficulty (KD)
• Search volume
• Traffic potential
• Parent topic
• Questions
• Terms containing specific modifiers

A good workflow:

1. Enter a broad seed keyword.
2. Open Matching Terms.
3. Filter: - KD: 0–30
4. Words: 4+
5. Volume: 20–1,000/month
6. Review SERPs manually before creating content.

Ahrefs is particularly strong because it combines keyword ideas with SERP competitiveness and traffic potential. Ahrefs

Best for search intent: Semrush

If intent classification is your priority, Semrush is one of the strongest choices.

It labels keywords by intent:

• I = informational (“how to…”, “what is…”)
• C = commercial investigation (“best…”, “vs…”, “review…”)
• T = transactional (“buy…”, “pricing…”, “discount…”)
• N = navigational (brand searches)

Good workflow:

1. Put in a competitor domain.
2. Use Keyword Gap.
3. Filter: - Intent = Commercial/Transactional
4. KD = Easy/Medium
5. Volume > 50
6. Export opportunities your competitors rank for but you don’t.

Semrush’s keyword tools include difficulty scoring and intent indicators. HubSpot Blog Semrush

Best budget option: KWFinder

If you’re building a niche site, blog, or small business website, KWFinder is easier to use than enterprise tools.

Good filters:

• Low SEO difficulty
• Long keyword phrases
• Questions
• SERP competitiveness

It is especially useful for finding realistic targets rather than huge keywords dominated by authority sites. Zapier

Best for finding “easy wins”: LowFruits

LowFruits is designed around finding weak spots in search results.

Useful for:

• Affiliate sites
• Local SEO
• New websites
• Content sites with low authority

It looks for keywords where ranking pages have weaknesses (for example, forums, low-authority domains, or poorly optimized pages). BestPage

Free/cheap workflow

If you don’t want to pay for a full SEO suite:

1. Use Google Keyword Planner to generate ideas.
2. Use AnswerThePublic for question-based long tails.
3. Check difficulty manually with a free Semrush keyword checker.
4. Validate the SERP before writing.

Zapier Semrush## My recommended setups

New website / niche site

• KWFinder + LowFruits

SEO agency or content team

• Ahrefs + Semrush

SaaS/content marketing

• Semrush + Ahrefs

Tight budget

• Google Keyword Planner + free Semrush checks + Google Search Console

A practical filter I’d use for finding long-tail opportunities:

• Search volume: 20–1,000/month
• Keyword length: 4+ words
• Difficulty: under 30 (adjust by niche authority)
• Intent: commercial or problem-solving informational
• SERP: at least 2–3 weak competitors on page one

This tends to surface keywords that have enough demand but are still realistic to rank for.

If your main goal is finding long-tail keywords and then filtering them by search intent + ranking difficulty, I’d shortlist these:

1. Semrush — probably the best fit

semrush.com

This is the one I'd start with. Its Keyword Magic Tool lets you generate huge numbers of related keywords and filter them simultaneously by keyword difficulty, search intent, volume, word count, questions, SERP features, and included/excluded terms. Semrush Semrush

A useful workflow would be:

Seed keyword → long-tail/word-count filter → KD < 30 → informational/commercial intent → volume filter → manually inspect SERPs

Semrush also has Personal Keyword Difficulty, which attempts to adjust difficulty to your particular domain rather than treating every site identically. Semrush

2. Ahrefs — best for serious SEO research

ahrefs.com

Ahrefs is excellent if you want to go beyond a simple KD number. Keywords Explorer can generate thousands of ideas, cluster them, show Keyword Difficulty, Traffic Potential, Parent Topic, and analyze the actual SERPs. Ahrefs

It also lets you bulk-filter keywords by informational, navigational, commercial, and transactional intent, as well as branded/local attributes. Ahrefs Help Center

One important distinction: Ahrefs' KD is primarily based on the number of referring domains pointing to the top-ranking pages. Ahrefs Help Center So I wouldn't blindly treat a KD of 10 as "easy."

3. LowFruits — excellent for finding actually easy long-tails

lowfruits.io

This is particularly interesting if you're running a smaller/newer site.

LowFruits analyzes SERPs in bulk and looks for signs of weak competition rather than relying solely on a conventional KD score. Its documentation explicitly positions it around finding low-competition long-tail opportunities and identifying weak SERPs. LowFruits

I'd use it when your question is:

"Which keywords have competitors that I could realistically beat?"

rather than merely:

"Which keywords have a low numerical KD?"

My recommendation

If you're building a keyword-opportunity workflow, I'd use:

Semrush → LowFruits → Google SERP validation

For example, you could filter for:

• Word count: 4+ words
• Volume: 50–1,000/month
• KD: <30
• Intent: informational or commercial
• Exclude: branded terms
• Then inspect the SERPs for weak/small sites

That combination is much more useful than simply sorting a giant keyword list by search volume.

If you tell me what type of site/niche you're doing keyword research for and roughly how authoritative the site is, I can also give you a specific filter recipe (volume, KD, intent, word count, etc.) for finding low-competition long-tail opportunities.

A useful workflow would be:

Seed keyword → long-tail/word-count filter → KD < 30 → informational/commercial intent → volume filter → manually inspect SERPs

Semrush also has Personal Keyword Difficulty, which attempts to adjust difficulty to your particular domain rather than treating every site identically. Semrush

2. Ahrefs — best for serious SEO research

ahrefs.com

Ahrefs is excellent if you want to go beyond a simple KD number. Keywords Explorer can generate thousands of ideas, cluster them, show Keyword Difficulty, Traffic Potential, Parent Topic, and analyze the actual SERPs. Ahrefs

It also lets you bulk-filter keywords by informational, navigational, commercial, and transactional intent, as well as branded/local attributes. help.ahrefs.com

One important distinction: Ahrefs' KD is primarily based on the number of referring domains pointing to the top-ranking pages. help.ahrefs.com So I wouldn't blindly treat a KD of 10 as "easy."

3. LowFruits — excellent for finding actually easy long-tails

lowfruits.io

This is particularly interesting if you're running a smaller/newer site.

LowFruits analyzes SERPs in bulk and looks for signs of weak competition rather than relying solely on a conventional KD score. Its documentation explicitly positions it around finding low-competition long-tail opportunities and identifying weak SERPs.

I'd use it when your question is:

"Which keywords have competitors that I could realistically beat?"

rather than merely:

"Which keywords have a low numerical KD?"

My recommendation

If you're building a keyword-opportunity workflow, I'd use:

If your goal is specifically “find long-tail keywords → filter by search intent → filter by difficulty → prioritize realistic opportunities,” these are the tools I’d look at:

1. Semrush — probably the best fit

semrush.com

This is the one I'd start with. Keyword Magic Tool lets you filter by keyword difficulty, search intent, volume, word count, questions, SERP features, and include/exclude terms. That makes it particularly good for systematically finding long-tail opportunities. Semrush Semrush

For example, you could set:

• Word count: 4+
• KD: 0–30
• Intent: Informational
• Volume: 50+
• Then sort by volume or potential

Semrush also has Personal Keyword Difficulty, which attempts to estimate difficulty specifically for your domain, rather than treating every site as equally authoritative. Semrush

My pick if you want one tool.

2. Ahrefs — best if you care about the SERP behind the keyword

ahrefs.com

Ahrefs is excellent for finding long-tail variants through Matching terms, Related terms, Questions, and Search suggestions. You can then filter the results by KD, volume, and search intent. Ahrefs Help Center Ahrefs Help Center

Its big advantage is what happens after you've found the keyword: you can dig into the actual SERP, backlinks, traffic potential, parent topic, and ranking pages. Ahrefs' KD is primarily based on the referring domains pointing to the top-ranking pages. Ahrefs

I'd choose Ahrefs over Semrush if you're doing serious competitor/SERP analysis.

3. LowFruits — best for finding genuinely weak SERPs

lowfruits.io

This is worth considering if your primary objective is “show me keywords where I actually have a chance of ranking.”

It's more opportunity-focused than simply giving you a gigantic keyword database. That's particularly useful for newer/smaller sites where a keyword with KD 25 in one tool can still be difficult because the SERP is dominated by strong domains.

4. Keyword Insights — best for turning keywords into content opportunities

keywordinsights.ai

I'd look at this if you're going beyond keyword discovery and want to answer:

“Which of these 500 long-tail keywords should actually become separate pages, and which should be covered by the same page?”

Its clustering and intent-oriented workflow can be particularly useful for building a content plan rather than just collecting keywords.

What I'd use

For most people: Semrush.

For an established SEO operation: Ahrefs + Semrush.

For a newer site trying to find easy wins: LowFruits + either Semrush or Ahrefs.

And I wouldn't use KD alone as the final filter. A much better workflow is:

Long-tail → intent → KD → SERP weakness → business value

For example, don't automatically choose every keyword with KD <20. Look for keywords where the SERP contains small/weak sites, poorly matched content, outdated pages, forums, or pages that don't directly satisfy the query. Ahrefs itself recommends using KD as an initial filter and then doing SERP analysis because KD doesn't capture every ranking factor. Ahrefs

If you tell me your niche/site and roughly how authoritative the site is (new, established, DR/DA if you know it), I can also give you a concrete filter setup—e.g. “set these exact filters in Semrush to uncover 100–500 realistic long-tail opportunities.”

If you want to discover long-tail keyword opportunities and filter by search intent + ranking difficulty, look for tools that combine:

• keyword expansion (questions, modifiers, related terms)
• search intent classification (informational, commercial, transactional)
• keyword difficulty (KD/competition)
• SERP analysis (who ranks and why)
• competitor keyword discovery

Here are the strongest options:

Ahrefs mangools## My picks by use case

Best overall: Ahrefs

Use it if you want to find:

• "how to..." queries
• competitor keywords
• low-volume but valuable topics
• keywords where the current ranking pages are weak

Typical workflow:

1. Enter a broad seed keyword.
2. Open Matching Terms.
3. Filter: - Volume: 10–500/month
4. KD: low range (for newer sites)
5. Include: questions/modifiers
6. Check SERPs before creating content.

Ahrefs is particularly useful because it combines keyword metrics with SERP and competitor analysis rather than relying only on keyword volume. Ahrefs Ahrefs

Best for intent filtering: Semrush

Semrush is strong if your priority is separating:

• Informational: "how to repair..."
• Commercial: "best X for..."
• Transactional: "buy X..."

A good workflow:

1. Use Keyword Magic Tool.
2. Filter intent = Commercial or Transactional.
3. Filter KD below your site's authority level.
4. Export clusters.

Semrush is often preferred for teams that need keyword intent labels directly in the workflow. HubSpot Blog

Best budget option: KWFinder

KWFinder is simpler and easier to learn. It shows:

• keyword ideas
• search volume
• keyword difficulty
• intent signals
• SERP results

It is a good fit if you do not need a full enterprise SEO suite. mangools

A practical filtering formula

For a newer site, I would usually start with:

Priority keywords

• Search volume: 20–500/month
• Difficulty: low to moderate
• Intent: commercial or problem-solving informational
• SERP: at least a few weaker pages ranking

Examples:

Instead of:

• "running shoes"

Look for:

• "best running shoes for flat feet under $100"
• "how to stop heel pain while running"
• "trail running shoes for beginners"

The long-tail versions usually reveal clearer search intent.

Free stack

If you want to spend $0:

1. Google Autocomplete → discover phrases
2. Google Keyword Planner → estimate demand
3. Google Search Console → find terms you already rank for
4. Ahrefs Webmaster Tools → limited SEO insights
5. Manually check SERPs for difficulty

Ahrefs Media Search GroupFor most content sites, a strong combination is Semrush or Ahrefs for discovery + Google Search Console for real performance data.

If your goal is specifically “find long-tail keywords → filter by search intent → filter by ranking difficulty,” there are a few strong options.

1. semrush.com — my pick for your use case

Semrush is probably the best single tool if this is exactly what you want.

You can enter a seed keyword and then filter the results by:

• Keyword Difficulty (KD)
• Search intent — informational, navigational, commercial, transactional
• Word count — useful for explicitly finding 4+ word long-tails
• Search volume
• CPC
• SERP features
• Included/excluded terms

It also automatically groups related keywords into topical subgroups. Semrush Semrush

A useful workflow would be:

Seed keyword → Word count ≥4 → KD <30 → select desired intent → sort by volume

Semrush specifically documents using word count + KD filters to identify long-tail opportunities. Semrush

Its Personal Keyword Difficulty (PKD) is particularly interesting because it can estimate difficulty for your specific domain, rather than treating every website equally. Semrush

2. ahrefs.com — best for serious SEO research

Ahrefs is arguably better if you want to go beyond basic keyword filtering.

Keywords Explorer can generate thousands of keyword ideas, show Keyword Difficulty, search volume, Traffic Potential, and identify search intent. You can filter keywords by the four major intent categories and other attributes. Ahrefs Help Center Ahrefs

Its Matching terms, Related terms, Questions, and Search suggestions reports are particularly useful for long-tail discovery. Ahrefs Help Center

I'd choose Ahrefs if you're also going to do:

• Competitor keyword research
• Content gap analysis
• Backlink research
• SERP analysis
• Traffic-potential analysis
• Finding keywords where weak sites are already ranking

3. LowFruits — worth considering if your priority is easy wins

LowFruits takes a somewhat different approach: instead of simply giving you a generic KD number, it focuses heavily on finding SERPs where weak/low-authority websites are already ranking.

That's extremely useful for a newer site because a keyword with “KD 20” isn't necessarily easy if the SERP is dominated by very authoritative sites.

I'd consider it as a companion to Ahrefs/Semrush, rather than necessarily your only SEO platform.

4. mangools.com — simpler option

If Semrush and Ahrefs feel like overkill, KWFinder is much easier to learn.

It's good for:

• Long-tail suggestions
• Search volume
• Keyword difficulty
• SERP analysis
• Basic competitor research

But its intent filtering and broader SEO capabilities aren't as sophisticated as Semrush/Ahrefs.

What I'd actually use

If you're building a content site and want low-competition opportunities:

Semrush → LowFruits

Use Semrush to generate and classify thousands of keywords, then use LowFruits/SERP analysis to validate whether the supposedly “easy” keywords actually have weak competition.

If you're doing professional SEO:

Ahrefs or Semrush

Either can handle the entire workflow without needing another tool.

If you're just starting:

Semrush's free keyword tool is worth trying first. It provides keyword suggestions, volume, KD, intent and long-tail opportunities, although the full Keyword Magic Tool gives you substantially more filtering and organization. Semrush Semrush

A good filtering recipe

For example, suppose your seed is “project management software.”

I'd start with:

• Word count: 4+
• KD: 0–30
• Intent: Informational + Commercial
• Volume: 20+ searches/month
• Exclude: irrelevant modifiers
• Then manually inspect the SERP

The important part is not to blindly pick every keyword with KD <30. Difficulty scores are estimates. The SERP itself tells you whether the opportunity is genuinely attainable.

If you tell me what niche/site you're doing keyword research for, I can also give you a specific Semrush/Ahrefs filtering formula for finding high-intent, low-difficulty long-tail keywords.

If you're doing professional SEO:

Ahrefs or Semrush

Either can handle the entire workflow without needing another tool.

If you're just starting:

Semrush's free keyword tool is worth trying first. It provides keyword suggestions, volume, KD, intent and long-tail opportunities, although the full Keyword Magic Tool gives you substantially more filtering and organization.

A good filtering recipe

For finding long-tail keyword opportunities and filtering by search intent + ranking difficulty, these are the strongest options:

Ahrefs Semrush## Best picks by use case

Best overall: Ahrefs

Use it if you want to uncover:

• long-tail variations
• question keywords
• competitor keywords you don't rank for
• low-KD opportunities

Workflow:

1. Enter a seed topic in Keywords Explorer.
2. Open Matching Terms or Questions.
3. Filter by: - Keyword Difficulty (KD)
4. Search volume
5. Traffic Potential
6. Word count
7. Review SERPs before choosing targets.

Ahrefs also lets you analyze competitor pages to find keywords they already rank for, which is often one of the fastest ways to discover long-tail opportunities. Ahrefs Ahrefs

Best for intent filtering: Semrush

Semrush is particularly strong if you want to sort keywords by:

• Informational intent ("how to...")
• Commercial investigation ("best...")
• Transactional intent ("buy...")
• Navigational intent (brand searches)

Its Keyword Magic Tool generates large keyword lists and provides search volume, keyword difficulty, CPC, and intent filters. Semrush Semrush

Best budget option: LowFruits

Good if your goal is:

"Find keywords where weaker websites are already ranking."

It focuses less on massive keyword databases and more on identifying realistic targets for newer sites.

A practical filtering method

For a newer website, I’d start with:

1. Generate keywords:

• Seed keyword → thousands of suggestions
• Include question modifiers: - "how to"
• "best"
• "vs"
• "for beginners"
• "near me"
• "under $X"
• "without"
• "alternative to"
• Apply filters:

• Difficulty: low (for example KD under ~30, depending on niche)
• Intent: - Commercial/transactional for revenue pages
• Informational for traffic-building content
• Volume: don't exclude very low volume terms; many valuable long tails have modest volume
• Check SERPs manually:

• Are forums, small sites, or thin pages ranking?
• Are the top results poorly matched to the query?
• Can you create something clearly better?

My recommended stack

• Serious SEO site: Ahrefs + Google Search Console
• Content marketing team: Semrush + Google Search Console
• New niche site: LowFruits + Google Search Console
• Low budget: Mangools/KWFinder + free Ahrefs/Semrush tools

For most people trying to find long-tail keywords with clear intent and realistic ranking chances, Ahrefs and Semrush are the two strongest choices. Ahrefs Semrush

A practical filtering method

For a newer website, I’d start with:

1. Generate keywords:

• Seed keyword → thousands of suggestions
• Include question modifiers: - "how to"
• "best"
• "vs"
• "for beginners"
• "near me"
• "under $X"
• "without"
• "alternative to"
• Apply filters:

• Difficulty: low (for example KD under ~30, depending on niche)
• Intent: - Commercial/transactional for revenue pages
• Informational for traffic-building content
• Volume: don't exclude very low volume terms; many valuable long tails have modest volume
• Check SERPs manually:

• Are forums, small sites, or thin pages ranking?
• Are the top results poorly matched to the query?
• Can you create something clearly better?

My recommended stack

If your main goal is “find lots of long-tail keywords, then filter by search intent + ranking difficulty”, I’d shortlist these:

1. Semrush — probably the best fit

Semrush is particularly good for exactly this workflow.

Its Keyword Magic Tool lets you generate huge lists from a seed keyword and filter by:

• Keyword Difficulty
• Search intent
• Search volume
• Word count
• Questions
• SERP features
• CPC
• Include/exclude terms

It also has Personal Keyword Difficulty (PKD), which attempts to estimate difficulty specifically for your domain, rather than treating every site as equally authoritative. Semrush Semrush

For example, you could start with:

project management software

Then filter roughly:

Intent: Informational
KD: <30
Word count: 4+
Volume: 50+

That quickly gets you toward queries such as “how to choose project management software for small teams” rather than just the enormous head term.

2. Ahrefs — best if you care about SERP competitiveness

Ahrefs is my other top choice.

Keywords Explorer can generate thousands of keyword ideas, filter them by search intent, difficulty, volume, traffic potential, etc., and analyze the actual SERPs. Its KD metric is based primarily on the backlink strength of the pages ranking in the top 10. Ahrefs Help Center Ahrefs

One particularly useful feature is finding long-tail keywords where weak sites are already ranking. That's often more actionable than simply looking for a low KD number. Ahrefs

3. LowFruits — excellent for “easy wins”

If you're running a relatively small/new site, I'd seriously consider LowFruits.

Its approach is different: rather than simply saying “KD = 18,” it looks for weak websites/pages appearing in the SERPs. That can help identify long-tail queries where Google is already willing to rank relatively weak competitors.

That's often the more useful question:

“Can my site realistically rank here?”

rather than:

“Does this keyword have a low proprietary difficulty score?”

My recommendation

If I were choosing today:

• One tool: Semrush — strongest combination of keyword discovery + intent + difficulty filtering.
• SEO-heavy workflow: Ahrefs — especially if you want deep SERP/backlink analysis.
• Small/new site trying to find winnable long tails: LowFruits + Ahrefs/Semrush.
• Budget-conscious beginner: Mangools KWFinder.

One important caveat: don't blindly filter on KD. Ahrefs itself recommends using KD as an initial filter and then doing actual SERP analysis, because a numerical difficulty score can't capture every factor affecting whether your particular site can rank. Ahrefs

If your objective is specifically finding hundreds/thousands of low-competition long-tail keywords for a content site, I can also give you a step-by-step Semrush/Ahrefs filtering recipe (including the exact volume, KD, intent, word-count, and SERP filters I'd use).

That quickly gets you toward queries such as “how to choose project management software for small teams” rather than just the enormous head term.

2. Ahrefs — best if you care about SERP competitiveness

Ahrefs is my other top choice.

Keywords Explorer can generate thousands of keyword ideas, filter them by search intent, difficulty, volume, traffic potential, etc., and analyze the actual SERPs. Its KD metric is based primarily on the backlink strength of the pages ranking in the top 10. Ahrefs Help Center Ahrefs

One particularly useful feature is finding long-tail keywords where weak sites are already ranking. That's often more actionable than simply looking for a low KD number. Ahrefs

3. LowFruits — excellent for “easy wins”

If you're running a relatively small/new site, I'd seriously consider LowFruits.

Its approach is different: rather than simply saying “KD = 18,” it looks for weak websites/pages appearing in the SERPs. That can help identify long-tail queries where Google is already willing to rank relatively weak competitors.

That's often the more useful question:

“Can my site realistically rank here?”

rather than:

“Does this keyword have a low proprietary difficulty score?”

My recommendation

If I were choosing today:

• One tool: Semrush — strongest combination of keyword discovery + intent + difficulty filtering.
• SEO-heavy workflow: Ahrefs — especially if you want deep SERP/backlink analysis.
• Small/new site trying to find winnable long tails: LowFruits + Ahrefs/Semrush.
• Budget-conscious beginner: Mangools KWFinder.

One important caveat: don't blindly filter on KD. Ahrefs itself recommends using KD as an initial filter and then doing actual SERP analysis, because a numerical difficulty score can't capture every factor affecting whether your particular site can rank.

If your main goal is finding long-tail keywords and then filtering them by search intent + ranking difficulty, I’d narrow the field to these:

1. Semrush — my pick for your use case

semrush.com is probably the closest match to exactly what you're describing.

You can enter a seed topic and then filter the resulting keywords by:

• Keyword Difficulty
• Search intent — informational, navigational, commercial, transactional
• Word count — useful for isolating long-tail queries
• Search volume
• SERP features
• CPC
• Included/excluded words

It also groups keywords into increasingly specific subtopics, which is useful for discovering clusters of long-tail opportunities rather than just individual keywords. Semrush Semrush

For example, you could use filters roughly like:

Word count: 4+
KD: under 30
Intent: informational + commercial
Volume: 50+

That immediately gives you a much more manageable pool of specific, potentially attainable topics.

2. Ahrefs — excellent if SERP competitiveness matters most

ahrefs.com is my other top choice.

Its big advantage is that you can combine keyword ideas, KD, traffic potential, SERP analysis, parent topics, and search intent. Ahrefs also lets you filter keywords by intent and other attributes in bulk. Ahrefs Help Center Ahrefs

For long-tail research, Ahrefs specifically recommends using its Matching terms and Questions reports and applying volume/KD filters. Ahrefs

I'd choose Ahrefs over Semrush if your workflow is heavily focused on analyzing the actual SERPs and backlinks of competing pages.

3. LowFruits — interesting if you're trying to find easy keywords

LowFruits is worth considering if your real question is:

"Which long-tail keywords have weak websites already ranking?"

That's often more useful than blindly trusting a KD score. A keyword can have a low numerical difficulty but still have a SERP dominated by very authoritative sites.

LowFruits specializes in identifying these weaker SERPs, making it particularly attractive for newer/smaller sites.

What I'd use

If you're starting from scratch: Semrush.

If you're doing serious SEO/content research: Ahrefs.

If you already have a keyword list and want to find the easiest opportunities: LowFruits alongside Ahrefs/Semrush.

One important point: don't filter solely by keyword difficulty. KD is an estimate, and different platforms calculate it differently. For example, Ahrefs' KD is primarily based on referring domains to the top-ranking pages. Ahrefs Help Center

A better opportunity filter is:

Long-tail + relevant intent + low/moderate difficulty + weak SERP competitors + meaningful traffic potential.

If you tell me what kind of site/business you're doing SEO for, I can also give you a concrete filter recipe (e.g. exact Semrush/Ahrefs settings) for finding low-competition long-tail keywords with commercial intent.

Yes. If your goal is specifically long-tail keyword discovery + search-intent filtering + keyword-difficulty filtering, I’d narrow the field to these:

My top 3

1. Semrush — best match for exactly what you're asking

Its Keyword Magic Tool lets you generate huge numbers of related/long-tail keywords and filter by keyword difficulty, search intent, word count, volume, CPC, SERP features, etc. It also has a Personal Keyword Difficulty score that attempts to estimate difficulty specifically for your domain. www.semrush.comwww.semrush.com

A particularly useful workflow is:

Seed keyword → Word count ≥ 4 → KD ≤ 30 → Intent = informational/commercial → sort by volume

Semrush explicitly supports filtering by word count for long-tail discovery. www.semrush.com

2. Ahrefs — best if you want deeper SERP/competitor analysis

Keywords Explorer has billions of keywords and lets you filter by informational, navigational, commercial, and transactional intent, as well as keyword difficulty. help.ahrefs.com

Its big advantage is that you can go beyond the KD number and examine the actual SERPs, referring domains, traffic potential, and competing pages. Ahrefs' KD is primarily based on the backlinks/referring domains of pages ranking in the top 10. help.ahrefs.com

3. LowFruits — best if your priority is finding keywords you can actually rank for

I'd look at this one if you're working with a new or relatively low-authority site. Its philosophy is less "give me the biggest keywords" and more "show me keywords where weak sites are already ranking."

That can be extremely useful because a keyword with KD 15 isn't necessarily easy if the SERP is dominated by huge authoritative sites, while a keyword with a somewhat higher numerical difficulty can sometimes be surprisingly attainable.

If I were choosing for a new site

I'd probably use:

LowFruits → Semrush → Ahrefs

Use LowFruits to discover low-competition opportunities, Semrush to build/filter the larger keyword universe, and Ahrefs to manually validate the SERPs before committing to an article.

If you only want to pay for one, I'd choose Semrush for your particular requirements. Its current Keyword Magic Tool is almost exactly the workflow you described: massive keyword discovery + long-tail filtering + intent + difficulty. www.semrush.comwww.semrush.com

One important caveat: don't treat keyword difficulty as an absolute ranking probability. It's a third-party estimate. The actual SERP—especially the authority and quality of the pages currently ranking—is often more informative. Ahrefs itself describes KD as an estimate of the resources required to rank, rather than a guarantee. ahrefs.com

If you tell me your niche/site and whether it's new or established, I can also give you a concrete filtering recipe (e.g. volume ≥ 50, KD ≤ 20, 4+ words, commercial intent) for finding long-tail opportunities.

Yes. If your specific goal is “find long-tail keywords → filter by intent → filter by ranking difficulty → identify realistic opportunities,” I’d shortlist these:

1. Semrush — probably the best fit

Semrush Keyword Magic Tool lets you start with a seed keyword and then filter by keyword difficulty, search intent, word count, volume, CPC, SERP features, and include/exclude terms. It also automatically groups related keywords into topical subgroups. www.semrush.com

For example, you could do:

Seed: running shoes

Then filter:

• Word count: 4+
• KD: <30
• Intent: Informational or Commercial
• Volume: 50+
• Include: best, for, how, vs, etc.

That gets you much closer to “long-tail opportunities I can realistically rank for” rather than just a giant keyword list. Semrush specifically supports a word-count filter for finding 4+ word long-tail phrases. www.semrush.com

My pick if you want one tool.

2. Ahrefs — best if you care heavily about competition/SERPs

Ahrefs Keywords Explorer is excellent for finding long-tail variations and evaluating whether the SERP is actually beatable.

It has Keyword Difficulty, search volume, Traffic Potential, SERP analysis, keyword clustering, and search-intent analysis. ahrefs.com

A particularly useful feature is filtering for keywords where low-authority/weak websites are already ranking. That's often more actionable than simply looking at a KD number. ahrefs.com

Ahrefs also now allows bulk filtering by search-intent attributes in Keywords Explorer. www.semrush.comhelp.ahrefs.com

I'd choose Ahrefs over Semrush if your workflow is heavily competitor/SERP-driven.

3. LowFruits — interesting if your #1 objective is finding winnable keywords

LowFruits takes a somewhat different approach: rather than simply saying “this keyword has KD 18,” it emphasizes finding SERPs where weak sites are already ranking.

That's valuable because a keyword with a nominally low difficulty score can still be difficult if the SERP is dominated by very authoritative sites.

So I'd use:

Semrush/Ahrefs → generate huge keyword universe

then:

LowFruits → identify the genuinely weak SERPs worth attacking.

What I'd actually use

If you're building an SEO site/content strategy, my preferred workflow would be:

1. Semrush or Ahrefs
↓
Generate thousands of related keywords.

2. Filter for long-tail
4+ words

3. Filter by intent
For example:

• Informational
• Commercial
• Transactional

4. Filter difficulty
Start around KD 0–30 if the site is relatively new.

5. Check SERPs
Don't blindly trust the KD score. Look at who's actually ranking.

6. Look for weak competitors
A SERP with forums, Reddit, small niche sites, outdated articles, or low-authority domains can be much more attractive.

7. Cluster keywords by topic
Instead of creating one article for every slightly different long-tail query, group queries with the same search intent into a single page.

If I had to pick just one:

🥇 Semrush — best combination of long-tail discovery + intent + difficulty + filtering.

🥈 Ahrefs — arguably better for serious SERP/competitor analysis.

🥉 LowFruits — excellent specialist tool for finding low-competition opportunities.

If you tell me what niche/site you're doing SEO for and roughly how authoritative/new the site is, I can also give you a specific keyword-filter recipe (e.g. volume, KD, word count, intent, SERP conditions) designed to uncover the easiest long-tail opportunities.

If you want to discover long-tail keyword opportunities and filter them by search intent + difficulty, look for tools that combine:

• keyword expansion (questions, related terms, autocomplete)
• keyword difficulty (KD/competition)
• search intent classification (informational, commercial, transactional)
• SERP analysis (who ranks and why)
• filtering/exporting

Here are the strongest options:

bestpage.ai

Best overall: Ahrefs

Use it if you want to find keywords competitors already rank for.

Workflow:

1. Enter a broad topic into Keywords Explorer.
2. Open Matching Terms.
3. Filter:
   • Volume: e.g. 10–500 searches/month
   • KD: low-to-medium
   • Include modifiers like:
     • “best”
     • “vs”
     • “for beginners”
     • “near me”
     • “how to”
     • “alternative”
4. Check SERP results before creating content.

Ahrefs is particularly strong for discovering long-tail variations and filtering by difficulty. ahrefs.com

Best for intent filtering: Semrush

Semrush is a good choice if you want to quickly separate:

• Informational: “how to repair a roof”
• Commercial: “best roofing company software”
• Transactional: “buy roof inspection drone”

Its Keyword Magic Tool provides keyword ideas with metrics such as volume, difficulty, CPC, and intent categories. blog.hubspot.com

Best budget option: KWFinder (Mangools)

Good if you don’t need a huge SEO suite.

Useful features:

• long-tail keyword suggestions
• autocomplete/question keywords
• keyword difficulty score
• SERP overview

mangools.com

Best for finding “easy wins”: LowFruits

Useful for newer sites because it focuses on finding keywords where weak pages already rank. This can uncover opportunities that look competitive by keyword metrics alone. bestpage.ai

Free/cheap stack

If you don’t want to pay:

1. Google Keyword Planner — baseline volume data
2. Google Search Console — find queries you already rank for
3. AnswerThePublic — discover questions
4. A spreadsheet — score opportunities manually

A practical filtering formula

For most content sites, start with:

• Search volume: 20–500/month
• Keyword difficulty: under 30–40
• Intent: prioritize:
  1. Commercial
  2. Transactional
  3. High-value informational
• SERP check:
  • avoid pages dominated by huge brands
  • look for forums, small blogs, weak content, or outdated pages

A good workflow is:
Semrush/Ahrefs → export keywords → filter by intent + KD → manually review SERPs → create content clusters.

If you tell me your niche (e.g., SaaS, ecommerce, local business, affiliate site), I can suggest the best tool stack and exact filters to use.

If your main goal is finding long-tail keywords and then filtering them by both search intent and ranking difficulty, I’d shortlist these:

1. Semrush — probably the best fit

Semrush's Keyword Magic Tool is particularly good for exactly this workflow. You can start with one seed keyword, generate huge numbers of related terms, and filter by:

• Search intent: informational, navigational, commercial, transactional
• Keyword Difficulty (KD)
• Search volume
• Word count
• Questions
• SERP features
• Include/exclude terms

It also lets you use Personal Keyword Difficulty (PKD), which estimates difficulty specifically for your domain, rather than treating every website as equally competitive. www.semrush.com

For example, you could set:

Word count: 4+
Intent: Commercial
KD: 0–30
Volume: 50+

That immediately gives you a list of relatively specific, commercially relevant keywords that may be attainable for a newer site. Semrush explicitly supports filtering by word count to surface long-tail terms. www.semrush.com

2. Ahrefs — excellent alternative

Ahrefs Keywords Explorer is arguably better if you care heavily about analyzing the actual SERPs and competitors.

It provides keyword ideas, KD, search volume, traffic potential, SERP analysis, clustering, and search-intent information. Ahrefs also allows bulk filtering by intent attributes. help.ahrefs.comahrefs.com

One particularly useful metric is Traffic Potential: instead of looking only at a keyword's search volume, Ahrefs estimates how much traffic the top-ranking page receives for that topic. That can help you avoid chasing keywords with seemingly good volume but poor actual traffic potential. help.ahrefs.comahrefs.com

What I'd choose

• Starting SEO / content site: Semrush
• Serious SEO agency or established site: Ahrefs or Semrush
• Need to filter specifically by intent + KD + long-tail length: Semrush
• Want competitor/SERP analysis and traffic potential: Ahrefs
• Want to experiment without paying immediately: Semrush's free keyword tool

One important caveat: don't treat a KD score as absolute truth. A "KD 20" keyword can still be difficult if the SERP is dominated by highly authoritative sites, while a higher-KD keyword can occasionally be surprisingly attainable. I would use KD as a screening metric and then manually inspect the first page.

If you tell me what niche/site you're doing keyword research for, I can also give you a concrete filtering recipe (e.g. volume 20–500 + KD <25 + commercial intent + 4+ words) that I'd use to uncover low-competition opportunities.

If your main requirement is “find lots of long-tail keywords, then filter by search intent + ranking difficulty”, I’d shortlist these:

1. Semrush — my top pick

Semrush Keyword Magic Tool

This is probably the closest match to exactly what you're asking for. Its Keyword Magic Tool has a database of 27B+ keywords and lets you filter by keyword difficulty, search intent, volume, CPC, word count, SERP features, and more. It also automatically groups keywords into topic/subtopic clusters. www.semrush.comwww.semrush.com

A useful workflow is:

Seed keyword → Keyword Magic Tool → KD < 30 → Commercial/Transactional intent → sort by volume → inspect SERPs

You can also use its Personal Keyword Difficulty (PKD) to estimate difficulty specifically for your domain, rather than treating generic KD as the whole story. www.semrush.comwww.semrush.com

Best if: you want one tool that handles keyword discovery, competitor research, intent, difficulty, and content planning.

2. Ahrefs — excellent alternative

Ahrefs Keywords Explorer

Ahrefs is particularly strong if you care about SERP analysis and competitive difficulty. Keywords Explorer can generate thousands of ideas, cluster them by Parent Topic, and analyze KD, traffic potential, search volume, and SERPs. ahrefs.com

It now also supports filtering keywords by informational, navigational, commercial, and transactional intent, plus branded/local attributes. help.ahrefs.com

Its KD is based primarily on the referring domains/backlinks pointing to the top-ranking pages, so it's particularly useful when you want to estimate the link authority needed to compete. help.ahrefs.comwww.semrush.com

Best if: you're serious about SEO and want to validate whether a keyword is actually beatable.

3. LowFruits — especially interesting for low-competition long tails

LowFruits

I'd look at this if your priority is finding keywords where relatively weak sites are already ranking.

That's often more useful than simply saying “KD = 18.” A keyword can have a low numerical difficulty score but still have a SERP dominated by very authoritative sites.

Best if: you're building a newer/smaller site and want “can I realistically rank for this?” opportunities.

4. Keyword Insights — better for turning keywords into content

Keyword Insights

This is less about endlessly generating keyword lists and more about figuring out which keywords belong on the same page.

That's important because you don't necessarily want to create one article for every long-tail keyword. Several queries with the same intent may be variations that Google expects one comprehensive page to answer.

Best if: you already have a large keyword list and want to turn it into an efficient content architecture.

5. Mangools — simpler option

Mangools

Mangools is easier to learn than Semrush/Ahrefs and has a useful combination of keyword suggestions and difficulty metrics.

Best if: you're doing SEO yourself and don't need the huge feature set of Semrush or Ahrefs.

What I'd choose

If you want one tool: Semrush.

It has almost exactly the filtering workflow you're describing: long-tail discovery + intent + KD + volume + SERP features. www.semrush.comwww.semrush.com

If you're an experienced SEO: Ahrefs + Semrush is a very strong combination.

If you're trying to find easy wins for a newer site: LowFruits + Semrush is particularly compelling.

A good filtering formula

Instead of simply searching for the highest-volume keywords, I'd build a filter like:

Word count ≥ 4
KD ≤ 30
Intent = commercial or transactional
Volume ≥ 50/month
Exclude branded terms
Then manually inspect the SERP

For informational content, switch the intent filter to informational.

One important caveat: KD is a screening metric, not a ranking guarantee. Semrush's KD and Ahrefs' KD are calculated differently, so I would always inspect the actual top 10 before committing to a keyword. help.ahrefs.comwww.semrush.com

If you tell me your niche/site and roughly how authoritative the site is (new, established, DR/DA if known), I can also give you a specific keyword-filtering setup and thresholds to use in Semrush/Ahrefs.

If your goal is specifically “find long-tail keywords → filter by search intent → filter by ranking difficulty”, I’d shortlist these:

1. Semrush — my pick for your use case

The Keyword Magic Tool is particularly well suited to this workflow. It has a huge keyword database and lets you filter by keyword difficulty, search intent, word count, questions, SERP features, volume, and more. www.semrush.com

A useful workflow is:

Seed keyword → Word count ≥ 4 → KD < 30 → Intent = informational/commercial → sort by volume

Semrush also has Personal Keyword Difficulty (PKD), which attempts to estimate difficulty specifically for your domain, rather than treating every website as equally competitive. www.semrush.com

Semrush Keyword Magic Tool

2. Ahrefs — excellent alternative

Keywords Explorer is probably the closest competitor. You can generate thousands of keyword ideas, filter by KD, search intent, volume, traffic potential, and cluster keywords by topic. ahrefs.com

Its intent filtering is particularly useful: Ahrefs lets you filter keywords according to its intent attributes, including informational, navigational, commercial, and transactional classifications. help.ahrefs.comwww.semrush.com

Its KD metric is primarily based on the backlink strength of the top-ranking pages, so I'd use it as a competition indicator rather than an absolute “can I rank?” score. help.ahrefs.com

Ahrefs Keywords Explorer

3. LowFruits — worth considering if you're building a newer site

If your priority is finding keywords where relatively weak websites are already ranking, LowFruits is worth testing. It's more focused on uncovering low-competition opportunities rather than being an all-in-one SEO platform.

What I'd choose

If you want one tool: Semrush

If you're doing serious competitor/content-gap research: Ahrefs

If your #1 objective is finding easy-to-rank long tails: LowFruits

One important caveat: don't filter solely by KD. A keyword with KD 15 isn't necessarily a better opportunity than one with KD 30. Look at the actual SERP—especially whether small/low-authority sites are ranking, whether the results genuinely satisfy the intent, and whether the keyword has meaningful traffic potential.

For example, I'd build a filter roughly like:

4+ words + informational/commercial intent + KD ≤ 30 + enough volume + weak domains in the top 10

That combination is much more useful for finding actionable long-tail opportunities than simply searching for keywords with low volume. Semrush explicitly supports word-count and KD filtering for this type of long-tail research. www.semrush.com

If you tell me your niche/site type and whether the site is new or established, I can also give you a precise keyword-research workflow and filter thresholds for finding the easiest opportunities.

If your goal is specifically “find lots of long-tail keywords → filter by search intent → filter by ranking difficulty”, I’d shortlist these:

1. Semrush Keyword Magic Tool — my pick for this use case

This is probably the closest match to exactly what you're asking for.

You can enter a seed keyword and get thousands/millions of related terms, then filter by:

• Search intent: informational, navigational, commercial, transactional
• Keyword difficulty
• Search volume
• Word count
• Questions
• SERP features
• CPC
• Include/exclude terms

Semrush currently says its Keyword Magic Tool has 27B+ keywords and supports simultaneous filtering by volume, difficulty and intent. www.semrush.com

A useful workflow would be:

Seed: project management software
→ Intent: commercial
→ KD: 0–30
→ Volume: 20+
→ Word count: 4+
→ exclude branded terms

That gets you much closer to “low-competition opportunities with actual buying intent” rather than just a huge list of keywords.

2. Ahrefs Keywords Explorer — best if you care about SERP quality

Ahrefs is excellent for finding long-tail opportunities through its Matching Terms, Related Terms, Questions, and Search Suggestions reports. You can then filter by KD, volume, traffic potential, etc. ahrefs.com

Its newer intent functionality lets you bulk-filter keywords by informational, navigational, commercial, and transactional intent, as well as branded/local attributes. help.ahrefs.com

The big advantage is that Ahrefs' KD is based on the backlink profiles of the top-ranking pages, so you can use it as an initial proxy for how difficult a SERP is. help.ahrefs.com

I'd choose Ahrefs over Semrush if: competitor analysis and manually evaluating the actual SERPs are a major part of your workflow.

3. LowFruits — best for finding weak competitors

This is particularly interesting if you're working on a new/small site.

Rather than simply saying “KD 15,” the concept is to identify SERPs where Google is ranking weak sites/pages, giving you opportunities that conventional keyword difficulty metrics can miss.

That's important because a keyword with “KD 10” isn't necessarily easy if the SERP is dominated by highly authoritative sites. Conversely, a moderately difficult keyword can sometimes be surprisingly attainable if several weak pages are ranking.

4. Keyword Insights — best for turning keywords into content

I'd consider this more of a keyword-to-content strategy tool than a pure keyword discovery tool.

It's particularly useful after you've collected thousands of long-tail terms and want to answer:

“Which of these keywords should actually be one article/page rather than 20 separate pages?”

Its clustering functionality can help prevent the classic SEO mistake of creating multiple articles targeting essentially the same search intent.

What I'd actually use

If you're building an SEO/content strategy, I'd probably go:

Semrush → LowFruits → Google/SERP analysis

For example:

1. Semrush: generate 10,000+ related keywords.
2. Filter to informational/commercial intent.
3. Filter to KD ≤ 30.
4. Filter for minimum search volume.
5. Export the shortlist.
6. LowFruits: identify SERPs where weak domains/pages are ranking.
7. Manually inspect the remaining SERPs.
8. Cluster keywords that have the same underlying intent.
9. Build content around the best opportunities.

One important caveat: don't treat keyword difficulty as an absolute ranking probability. Ahrefs itself recommends using KD as an initial filter and then analyzing the actual SERP, because backlink-based difficulty doesn't capture every ranking factor. ahrefs.com

If you want the simplest answer

• Best overall: Semrush
• Best for advanced SEO: Ahrefs
• Best for low-competition/weak-SERP opportunities: LowFruits
• Best for clustering keywords into articles: Keyword Insights

If you tell me your monthly budget (e.g. $0, <$50, $50–150, $150+) and whether you're doing affiliate SEO, SaaS, local SEO, or content marketing, I can narrow this down to the best 2–3 options for you.

If your main goal is finding long-tail keywords and then filtering them by search intent + ranking difficulty, I’d shortlist these:

1. Semrush — best all-around

This is probably the closest match to exactly what you're asking for.

Its Keyword Magic Tool lets you start with a seed keyword and generate huge numbers of related terms, including very specific long-tail variations. You can filter the results simultaneously by:

• Keyword Difficulty
• Search intent — informational, navigational, commercial, transactional
• Search volume
• Word count
• SERP features
• Included/excluded words

It also has Personal Keyword Difficulty (PKD), which attempts to estimate difficulty specifically for your domain rather than treating every site equally. www.semrush.com

Example workflow:

seed keyword → long-tail variations → KD < 30 → commercial intent → sort by volume

That's a very efficient way to find terms worth creating pages for.

2. Ahrefs — best for competitor gaps

I'd choose Ahrefs if your strategy is more:

"Show me the long-tail keywords that competitors are already ranking for, but I aren't."

Its strength is combining keyword research with competitor/content-gap analysis. It's particularly useful when you have several competitors whose organic keywords you can mine for opportunities.

3. LowFruits — excellent for genuinely low-competition terms

If difficulty is your #1 concern, I'd seriously consider LowFruits.

The interesting difference is that rather than relying exclusively on a generic KD number, tools in this category look for weak spots in the actual SERP—for example, results where relatively weak sites are ranking. That's often more actionable for small sites than simply saying a keyword has a KD of 18 or 25. Community SEO discussions also frequently mention LowFruits specifically for finding low-competition long tails. www.reddit.com

4. SE Ranking — good value

A good middle ground if Semrush/Ahrefs feel excessive for your needs. I'd look at it particularly if you're doing keyword research for several smaller sites and want an integrated SEO platform without going all the way into the enterprise-oriented suites.

What I'd pick

If you want one tool: Semrush.

It has the cleanest workflow for your specific requirement because long-tail discovery, intent classification, and KD filtering are all native to the same keyword table. www.semrush.com

If you're building niche/affiliate sites: Semrush + LowFruits is a particularly compelling combination.

If you're doing SEO for established sites: Ahrefs + Google Search Console is excellent, because you can combine estimated keyword data with the actual queries already generating impressions for your site.

One important caveat: don't treat KD as an absolute measure of ranking difficulty. A keyword with KD 20 can still be difficult if the SERP is dominated by extremely authoritative sites, while a KD 40 keyword can sometimes be surprisingly attainable. Look at the actual SERP and the sites ranking there before committing to a topic.

If your main goal is finding long-tail keywords and then filtering them by search intent + ranking difficulty, these are the strongest options:

1. Semrush Keyword Magic Tool — best overall

This is probably the closest match to exactly what you're asking for. You enter a seed keyword and can discover huge numbers of related/long-tail queries, then filter by:

• Search intent
• Keyword Difficulty
• Search volume
• Questions
• SERP features
• Topic/subtopic

Semrush says its Keyword Magic Tool currently contains 27+ billion keywords, with dedicated intent and difficulty analysis. www.semrush.com

Example workflow:

project management software → filter:

• Intent = Commercial
• KD = 0–30
• Volume = 50+
• Include = for small business

That can surface terms like best project management software for small business, rather than just the obvious head term.

2. Ahrefs Keywords Explorer — best for serious SEO research

Ahrefs is excellent if you want to combine long-tail discovery with SERP and backlink analysis.

It lets you generate thousands of keyword ideas, cluster them, identify search intent, and filter based on its 0–100 Keyword Difficulty (KD) score. ahrefs.com

One particularly useful feature is filtering keywords by intent attributes in bulk. help.ahrefs.com

I'd pick Ahrefs if you also care about answering:

"Okay, this keyword has low KD—but can my site actually beat the pages currently ranking?"

Its SERP/backlink data makes that analysis particularly useful.

3. LowFruits — best if your priority is easy-to-rank long tails

If you're specifically trying to uncover low-competition long-tail opportunities, I'd put LowFruits high on the list.

It's more specialized than Semrush/Ahrefs: instead of overwhelming you with millions of keywords, it emphasizes finding SERPs where relatively weak sites are already ranking.

It also has intent-oriented filtering, which is useful if you're looking for things like buyer/commercial keywords rather than purely informational traffic. www.youtube.com

4. SE Ranking — good middle ground

SE Ranking is worth considering if you want a broader SEO platform without necessarily going all-in on Ahrefs/Semrush. It combines keyword research, competitive research, rank tracking, backlink analysis, and site auditing. www.techradar.com

What I'd choose

If you want one tool: Semrush

If you're an SEO professional: Ahrefs

If your #1 objective is finding low-competition long tails: LowFruits

If budget matters: SE Ranking

And there's an important distinction: don't filter solely by KD. A keyword with KD 15 isn't automatically easier than one with KD 25. Look at the actual SERP—especially the authority/quality of the pages ranking and whether there are weak results.

A very effective filter is:

Long-tail + relevant intent + low KD + reasonable volume + weak SERP competitors

That's where the genuinely interesting opportunities tend to be.

If your main goal is finding long-tail keywords and then filtering them by both search intent and ranking difficulty, I’d shortlist these:

My picks

1. Ahrefs — best if you want sophisticated filtering

Ahrefs Keywords Explorer lets you generate thousands of keyword ideas, filter by Keyword Difficulty, search volume, and traffic potential, and analyze search intent. Its intent filters can be applied across large keyword sets. help.ahrefs.com

A useful workflow would be:

Seed keyword → Matching Terms → filter KD ≤ 20 → filter informational/commercial intent → sort by traffic potential → inspect SERPs

Ahrefs also has a Questions report that can be particularly useful for uncovering long-tail queries. ahrefs.com

2. Semrush — best for sheer keyword volume

Semrush's Keyword Magic Tool currently advertises a database of 27+ billion keywords. It provides filters for intent, keyword difficulty, search volume, questions, SERP features, and topic groups. www.semrush.com

If you want to enter something like:

running shoes

and rapidly drill down into thousands of variations such as:

best running shoes for flat feet beginners
running shoes for bad knees women
best cheap running shoes for marathon training

Semrush is excellent.

3. LowFruits — my choice if “easy wins” is the priority

If you're specifically trying to find long-tail keywords where relatively weak sites are already ranking, LowFruits is worth looking at. It's more focused on identifying low-competition opportunities rather than giving you an enormous all-purpose SEO platform.

What I'd choose

• Serious SEO / content site: Ahrefs
• Large-scale keyword research: Semrush
• New site trying to find easy-to-rank terms: LowFruits
• Budget-conscious: SE Ranking
• Just getting started: Ubersuggest

One important caveat: don't treat KD as the final measure of difficulty. Ahrefs' KD, for example, is primarily based on backlinks to the top-ranking pages. help.ahrefs.com A keyword with KD 15 can still be difficult if the SERP is dominated by highly authoritative sites, while a KD 30 query can sometimes be surprisingly attainable.

If you tell me your niche + whether the site is new or established, I can also give you a concrete keyword-research workflow with filters (e.g. volume, KD, intent, traffic potential) to find 50–100 realistic long-tail opportunities.

If your goal is specifically “find long-tail keywords → filter by search intent → filter by difficulty”, I’d shortlist these:

My picks

1. Ahrefs — best overall

Ahrefs' Keywords Explorer can generate thousands of keyword ideas, show Keyword Difficulty (KD), search volume, traffic potential, and search intent, and lets you filter keywords by intent attributes. help.ahrefs.com

A particularly useful workflow is:

Seed keyword → matching terms → intent = informational/commercial → KD ≤ 20 → sort by traffic potential.

Ahrefs' KD is 0–100 and is primarily based on the referring domains pointing to the top-ranking pages. help.ahrefs.com

2. Semrush — best for exploring a huge keyword universe

Semrush's Keyword Magic Tool has a database of 27B+ keywords, automatically groups related terms, and provides filters for keyword difficulty, intent, questions, SERP features, volume, and trends. www.semrush.com

I'd choose Semrush if you want to start with something broad like accounting software and drill down into hundreds/thousands of increasingly specific subtopics.

3. LowFruits — best if your priority is finding low-competition opportunities

This is the one I'd investigate if you're a smaller/newer site. Its philosophy is less about finding the biggest keyword database and more about identifying keywords where relatively weak sites are already ranking, which can be a much better proxy for an actual opportunity.

The important part: don't filter only by KD

For long-tail SEO, I'd use a filter stack roughly like:

Intent

• Informational
• Commercial investigation
• Transactional

Difficulty

• New/small site: KD 0–15
• Established site: KD 10–30
• Strong site: KD 20–50+

Then manually check the SERP.

A keyword with KD 8 isn't automatically easy. Conversely, a KD 25 keyword can sometimes be an excellent opportunity if the SERP contains weak or poorly matched pages.

If I were building a keyword-opportunity workflow

I'd probably use Ahrefs or Semrush + Google Search Console:

1. Enter 5–20 seed topics.
2. Generate thousands of related/long-tail queries.
3. Filter to your desired intent.
4. Filter by KD.
5. Remove irrelevant/low-business-value terms.
6. Look for keywords where competitors have weak pages.
7. Cluster related keywords into content topics.
8. Prioritize by business value × traffic potential × ranking difficulty, rather than volume alone.

If you tell me your niche/site and roughly how authoritative the site is, I can also give you a concrete filter recipe (e.g. KD <15 + commercial intent + volume 50–500 + weak SERPs) that you can plug directly into Ahrefs/Semrush.

Yes. If your main goal is “find lots of long-tail keywords, then filter by intent + ranking difficulty,” I’d shortlist these:

1. Ahrefs — my first choice

Ahrefs is particularly strong for this workflow. Keywords Explorer generates large numbers of keyword ideas and lets you analyze search volume, Keyword Difficulty, traffic potential, parent topics, and search intent. ahrefs.com

A useful workflow is:

Seed keyword → matching/related terms → KD filter → intent filter → SERP analysis

For example, you could filter toward:

• KD ≤ 20
• Informational or commercial intent
• Low/medium search volume
• 4+ word queries
• Relevant SERP features

Ahrefs also has a particularly useful “weak websites” approach, where you can identify keywords for which relatively weak domains are already ranking. ahrefs.com

2. Semrush — excellent alternative

Semrush's Keyword Magic Tool is excellent if you want a huge keyword universe plus intent categorization and competitive analysis. Its broader platform also makes competitor keyword-gap research very convenient. www.techradar.com

I'd choose Semrush over Ahrefs if your workflow involves a lot of:

competitor → keyword gap → intent → difficulty → content opportunities

3. LowFruits — best if “difficulty” is your biggest concern

LowFruits is interesting because it doesn't simply tell you “KD = 12.” It analyzes SERPs looking for weak-ranking competitors and other low-competition signals. That's useful because third-party KD scores are only proxies for actual ranking difficulty. lowfruits.io

For a newer/smaller site, I'd seriously consider this alongside Ahrefs.

4. Keyword Insights — best for intent + topical clustering

Keyword Insights is more focused on turning keyword lists into intent-based clusters and content plans. Its search-intent feature uses machine learning + LLM analysis to classify keywords and explain the intent of clusters. docs.keywordinsights.ai

It's particularly useful after you've already collected thousands of keywords.

What I'd use

If you're starting from scratch, I'd go:

Ahrefs → find opportunities → LowFruits → validate SERP weakness → Keyword Insights → cluster into content

If you only want one tool, I'd pick Ahrefs.

One important caveat: don't rely on keyword difficulty alone. Ahrefs itself notes that KD is primarily an estimate based on backlinks to ranking pages; actually inspecting the SERP can reveal opportunities that a numerical KD score misses. ahrefs.com

If you tell me your niche/site and whether you're targeting informational, affiliate, local, or SaaS keywords, I can also give you a specific filter recipe (e.g. KD <15 + 4+ words + commercial intent + X volume) for finding long-tail opportunities.

If you want to discover long-tail keyword opportunities and filter them by search intent and keyword difficulty, you’ll want an SEO keyword research platform that combines:

• Keyword discovery (thousands of related queries)
• Intent classification (informational, commercial, transactional, navigational)
• Difficulty metrics (KD, competition, backlink strength, SERP analysis)
• SERP analysis (who ranks and why)
• Filters for volume, CPC, word count, modifiers, etc.

Here are the strongest options:

Best picks by use case

1. Best overall: Ahrefs

• Use Keywords Explorer → Matching terms → Questions
• Filter by:
  • Word count (e.g., 4+ words)
  • KD (e.g., <20)
  • Volume
  • SERP features
• Great for finding queries like:
  • “best running shoes for flat feet beginners”
  • “how to fix [specific problem] without [constraint]”

2. Best for intent filtering: Semrush

• The Keyword Magic Tool is strong for large-scale discovery.
• It labels intent:
  • I = informational
  • C = commercial
  • T = transactional
  • N = navigational
• Useful for building content clusters:
  • TOFU: informational
  • MOFU: commercial investigation
  • BOFU: transactional

3. Best for low-competition long tails: LowFruits

• Designed specifically to find keywords where weak sites rank.
• Helpful filters:
  • Weak domains in SERPs
  • Low authority competitors
  • Low difficulty opportunities

4. Best free workflow
Use:

1. Google Search Console — find queries you already appear for
2. Google Keyword Planner — expand ideas
3. AnswerThePublic — find question-based long tails
4. Export to a spreadsheet and score by:
   • Intent
   • Difficulty
   • Business value

A practical filtering formula

For a new or low-authority site, try:

• Keyword length: 4–8 words
• Difficulty: <25 (Ahrefs/Semrush equivalent)
• Intent: Informational + commercial investigation
• Volume: 50–1,000 searches/month
• SERP: At least 2–3 weaker pages ranking

Example:

Instead of targeting:

“coffee grinder” (high competition)

Look for:

“best coffee grinder for espresso under $200”
“quiet coffee grinder for apartment use”
“manual coffee grinder vs electric for pour over”

If you are building a content site, my usual stack would be:

• Ahrefs or Semrush → keyword database + difficulty
• LowFruits → uncover easy wins
• Keyword Insights → cluster keywords by intent
• Google Search Console → refine based on real performance

For a smaller site trying to rank quickly, I’d prioritize LowFruits + Ahrefs; for an agency or larger SEO operation, Semrush + Ahrefs is the more complete setup.

If your goal is to find long-tail keywords and then filter them by search intent and keyword difficulty, there are several strong options depending on your budget and workflow.

Best overall: Ahrefs

Ahrefs is one of the strongest choices if you're focused on SEO.

It lets you:

• Generate millions of keyword ideas from a seed keyword.
• Filter by:
  • Keyword Difficulty (KD)
  • Search volume
  • Traffic potential
  • Number of words (great for finding long-tail phrases)
  • SERP features
• Group keywords by parent topic.
• Analyze the top-ranking pages to understand why they're ranking.

Example workflow:

• Search for "running shoes."
• Filter:
  • Word count ≥ 4
  • KD ≤ 20
  • Volume ≥ 100
• Export the results and organize by intent.

Best for search intent: Keyword Insights

If your priority is intent, Keyword Insights is especially useful.

It uses AI to:

• Classify keywords as informational, commercial, transactional, or navigational.
• Cluster keywords that can be targeted with a single page.
• Build content briefs around those clusters.

This can save a significant amount of manual review compared with relying only on keyword metrics.

Best budget option: LowFruits

LowFruits takes a different approach.

Instead of focusing mainly on keyword metrics, it identifies keywords where the search results contain weaker competitors, such as:

• Small blogs
• Forums
• Low-authority sites

This helps uncover opportunities where ranking may be easier even if the reported keyword difficulty isn't especially low.

Best all-in-one marketing suite: Semrush

Semrush combines keyword research with broader marketing tools.

Useful filters include:

• Search intent
• Keyword Difficulty %
• Volume
• Personal KD (based on your domain)
• CPC
• SERP features

It also includes a Keyword Magic Tool that is particularly effective for expanding long-tail variations.

If you want AI-assisted workflows

A practical combination is:

• Use Ahrefs or Semrush to discover keywords and collect metrics.
• Use Keyword Insights to classify intent and cluster related keywords.
• Use an AI writing assistant (or ChatGPT) to generate outlines and content briefs from those clusters.

Recommended setups by budget

• Under $50/month: LowFruits + Keywords Everywhere
• $100–150/month: Ahrefs Starter or Semrush Pro
• $200+/month: Ahrefs or Semrush + Keyword Insights for clustering and intent analysis
• Enterprise: Semrush Enterprise or Ahrefs Enterprise alongside dedicated content optimization platforms

For most content teams, Ahrefs + Keyword Insights provides one of the strongest combinations: Ahrefs excels at discovering high-potential long-tail keywords and estimating ranking difficulty, while Keyword Insights adds robust intent classification and keyword clustering to help you plan content efficiently.

If your goal is to find long-tail keywords and then filter them by search intent and keyword difficulty, there are several strong options depending on your budget and workflow.

Best overall: Ahrefs

Ahrefs is one of the strongest all-around keyword research platforms because you can:

• Generate thousands of long-tail keyword ideas.
• Filter by keyword difficulty (KD), search volume, traffic potential, and parent topic.
• Group keywords by search intent (informational, commercial, transactional, navigational).
• Analyze the current SERPs to see why pages are ranking.
• Identify low-difficulty keywords with meaningful traffic.

This is a solid choice if SEO is a core part of your work.

Best value: LowFruits

LowFruits is designed specifically for discovering low-competition long-tail opportunities.

Its strengths include:

• Finding keywords where weaker websites already rank.
• Highlighting "easy win" SERPs.
• Bulk keyword filtering.
• Lower cost than enterprise SEO suites.

It's particularly useful for bloggers, niche websites, and newer domains.

Best for marketing teams: Semrush

Semrush offers:

• Keyword Magic Tool with millions of long-tail keywords.
• Intent labels built in.
• Difficulty scores.
• Topic clustering.
• Competitor gap analysis.

If you're managing multiple websites or campaigns, it's a comprehensive platform.

Best budget option: KWFinder

KWFinder is easy to learn and provides:

• Long-tail suggestions.
• Keyword difficulty scores.
• SERP analysis.
• Geographic targeting.

It doesn't have as many advanced features as Ahrefs or Semrush, but many users find it offers excellent value.

Free or low-cost workflow

If you want to minimize costs, you can combine several tools:

1. Google Trends for emerging topics.
2. Google Search Console to find queries your site already ranks for.
3. KeywordTool.io or AnswerThePublic for long-tail ideas.
4. LowFruits or Mangools KWFinder to evaluate keyword difficulty.

If you're creating content with AI

A productive workflow is:

1. Discover long-tail keywords.
2. Filter by:
   • Intent: Informational or commercial.
   • Keyword difficulty: Under 20–30 (or another threshold appropriate for your site's authority).
   • Search volume: Above your minimum target.
3. Cluster related keywords into topic groups.
4. Generate content briefs and outlines.
5. Track rankings over time.

For newer websites, targeting keywords with lower difficulty and clear search intent often provides a better chance of earning traffic than pursuing broad, highly competitive terms.

If your goal is specifically to find long-tail keyword opportunities and filter them by search intent and keyword difficulty, these are the strongest options:

1. Ahrefs (best overall)

Ahrefs is one of the strongest tools if you care about ranking opportunities.

It lets you:

• Generate thousands of long-tail variations
• Filter by keyword difficulty (KD)
• Filter by search volume
• Group keywords by parent topic
• Identify search intent from the current SERP
• Analyze competitors' ranking keywords

A typical filter might be:

• KD: 0–20
• Volume: 50–1,000/month
• Word count: 4+ words
• Intent: Informational

Ahrefs' KD metric is based largely on the backlink profiles of the current top-ranking pages. ahrefs.com

2. Semrush

Semrush's Keyword Magic Tool is excellent for content planning.

Useful filters include:

• Intent
  • Informational
  • Commercial
  • Transactional
  • Navigational
• Keyword Difficulty
• Volume
• Questions only
• Include/exclude words

It's particularly good if you're building topical clusters.

3. LowFruits

LowFruits takes a different approach.

Instead of only showing keyword scores, it looks for SERPs containing weaker competitors such as:

• Forums
• Reddit
• Quora
• Small niche sites
• Low-authority blogs

This makes it excellent for finding keywords that established tools might still rate as moderately difficult but are practically easier to rank for.

4. Keyword.com

Keyword.com has become a solid mid-priced option.

It allows filtering by:

• Intent
• Difficulty
• Search volume
• Word count
• CPC

It also integrates with Google Search Console to surface opportunities from your existing rankings. keyword.com

5. Mangools KWFinder

KWFinder is simpler than Ahrefs or Semrush.

It includes:

• Difficulty score
• Search volume
• Trend
• CPC
• Related keywords
• Autocomplete keywords
• Questions

Many bloggers find it easier to learn than enterprise SEO platforms.

Best free stack

If you don't want to spend much:

• Google Keyword Planner for ideas
• Google Search Console for keywords you're already ranking for
• Ahrefs Free Keyword Difficulty Checker for quick KD checks
• AnswerThePublic for question-based long-tail ideas

Recommended filtering workflow

A practical workflow that works well in most niches is:

1. Enter a broad seed keyword.
2. Filter for:
   • Keyword Difficulty ≤ 20 (or ≤ 10 for a new site)
   • Search volume 50–1,000/month
   • At least 4 words
3. Filter by intent:
   • Informational for blog posts
   • Commercial for comparison articles
   • Transactional for landing or product pages
4. Check the current SERP manually. If the first page is dominated by large brands, the keyword may still be difficult despite a low KD score. Community discussions also emphasize pairing KD with SERP quality rather than relying on the score alone. www.reddit.com

For most people:

• Best overall: Ahrefs
• Best all-in-one marketing suite: Semrush
• Best budget option: KWFinder
• Best for uncovering low-competition opportunities: LowFruits
• Best free option: Google Keyword Planner + Google Search Console + Ahrefs' free KD checker

If you want to discover long-tail keyword opportunities and filter them by search intent and keyword difficulty, you’ll want an SEO keyword research tool that combines:

• Keyword expansion (finding variations, questions, related searches)
• Search intent classification (informational, commercial, transactional, navigational)
• Difficulty metrics (KD, competition, backlink strength, SERP analysis)
• SERP data (who ranks and why)

Here are some of the strongest options:

Best picks by use case

1. Finding low-competition long-tail keywords

• LowFruits — great for uncovering keywords where weak sites rank.
• Ahrefs — use filters like:
  • KD < 20
  • Volume > 50
  • Words > 4
  • SERP with forums, low-authority domains, or thin content

2. Filtering by search intent

• Semrush Keyword Magic Tool is one of the easiest because it labels keywords as:
  • Informational (“how to…”, “what is…”)
  • Commercial (“best…”, “review…”, “vs…”)
  • Transactional (“buy…”, “pricing…”)
  • Navigational (“brand + product”)

3. Building a content strategy

• Keyword Insights is useful because it clusters keywords by SERP similarity, helping you avoid writing dozens of articles that compete with each other.

4. Budget-friendly setup
A practical stack:

1. Google Search Console (find keywords you already rank for)
2. LowFruits (find easy opportunities)
3. AnswerThePublic (discover questions)
4. Google Keyword Planner (validate demand)

A good filtering workflow

For a niche site, I’d typically export keywords and filter:

Opportunity score

• Search volume: 50–5,000/month
• Keyword length: 4+ words
• Difficulty: low/moderate
• SERP:
  • Reddit/forums ranking
  • Small sites ranking
  • Pages with weak content

Intent

• Prioritize:
  • Commercial: “best X for Y”
  • Comparison: “X vs Y”
  • Problem-solving: “how to fix X”
  • Buyer questions: “is X worth it”

Avoid

• High-volume single words (“shoes”, “fitness”, “marketing”)
• Keywords dominated by huge brands
• Queries with unclear intent

If you’re building a new site, I’d lean toward LowFruits + Semrush or Ahrefs alone. If you already have traffic and want to expand, Semrush + Google Search Console is usually the most actionable combination.