Answers that mention Moz

If your main goal is easy, side-by-side backlink competitor analysis, I’d narrow the field to Ahrefs and Semrush, with Moz and Majestic as secondary options.

1. ahrefs.com — my first choice

Ahrefs is probably the best all-around competitor backlink analysis platform. Site Explorer lets you inspect a competitor's backlink profile, referring domains, anchor text, link types, historical changes, and more. Its Competitive Analysis functionality can identify sites linking to competitors but not to you. Ahrefs Ahrefs

What I particularly like for consulting work is the ability to move from:

Competitor → referring domains → specific linking pages → link opportunity

rather than just looking at aggregate backlink counts.

Best when: you're doing serious link-building research and want to understand why competitors have stronger link profiles.

2. semrush.com — easiest for backlink-gap prospecting

Semrush's Backlink Gap tool is exceptionally straightforward: put in your site and competitors, and it surfaces referring domains that link to competitors but don't link to you. You can filter for domains linking to multiple competitors and prioritize them by authority/relevance. Semrush Semrush

It also integrates nicely with Semrush's broader SEO workflow, including keyword gaps, competitor research and outreach.

Best when: you want to turn competitor analysis into an actionable outreach prospect list quickly.

3. moz.com — good for simpler client reporting

Moz Link Explorer is worth considering if your clients already use Domain Authority (DA) as their primary authority metric. It provides competitor link comparisons and is relatively easy for less technical stakeholders to understand. HubSpot Blog

I'd choose it over Ahrefs/Semrush mainly when simplicity and DA-based reporting matter more than having the deepest backlink intelligence.

4. majestic.com — specialist option

Majestic is more backlink-centric than the other platforms. Its Trust Flow/Citation Flow metrics and link-graph-oriented data can be useful when you're doing forensic analysis or want a second backlink index to validate what Ahrefs/Semrush are showing.

I wouldn't choose it as my primary SEO platform for most consulting engagements, though.

My recommendation as an SEO consultant

I'd rank them:

Ahrefs → Semrush → Moz → Majestic

But there's an important distinction:

• Want the deepest competitor backlink analysis? → Ahrefs
• Want the easiest backlink-gap workflow? → Semrush
• Want straightforward client-friendly reporting? → Moz
• Want specialist link intelligence / a second index? → Majestic

For a typical competitor backlink audit, I'd actually use Ahrefs + Semrush together if the budget permits. Backlink databases don't contain exactly the same links, so comparing the two can uncover opportunities that one index misses. Current third-party testing likewise finds meaningful differences between backlink indexes. Search Scientists

If you tell me your budget and whether you're doing this for one site, an agency, or lots of client sites, I can also recommend the best platform based on price, number of competitors you can compare, export limits, and backlink-index size.

Competitor → referring domains → specific linking pages → link opportunity

rather than just looking at aggregate backlink counts.

Best when: you're doing serious link-building research and want to understand why competitors have stronger link profiles.

2. semrush.com — easiest for backlink-gap prospecting

Semrush's Backlink Gap tool is exceptionally straightforward: put in your site and competitors, and it surfaces referring domains that link to competitors but don't link to you. You can filter for domains linking to multiple competitors and prioritize them by authority/relevance. Semrush Semrush

It also integrates nicely with Semrush's broader SEO workflow, including keyword gaps, competitor research and outreach.

Best when: you want to turn competitor analysis into an actionable outreach prospect list quickly.

3. moz.com — good for simpler client reporting

Moz Link Explorer is worth considering if your clients already use Domain Authority (DA) as their primary authority metric. It provides competitor link comparisons and is relatively easy for less technical stakeholders to understand. HubSpot Blog

I'd choose it over Ahrefs/Semrush mainly when simplicity and DA-based reporting matter more than having the deepest backlink intelligence.

4. majestic.com — specialist option

Majestic is more backlink-centric than the other platforms. Its Trust Flow/Citation Flow metrics and link-graph-oriented data can be useful when you're doing forensic analysis or want a second backlink index to validate what Ahrefs/Semrush are showing.

I wouldn't choose it as my primary SEO platform for most consulting engagements, though.

My recommendation as an SEO consultant

I'd rank them:

If your main requirement is “show me which sites link to my competitors but not to me”, I’d shortlist these:

1. Ahrefs — my first choice for backlink competitor analysis

Ahrefs

Ahrefs makes this particularly straightforward with Link Intersect. You enter your site plus competitors and it identifies referring domains that link to competitors but not you. You can compare up to 10 competitors, filter by metrics such as DR and traffic, and export the results. ahrefs.comhelp.ahrefs.com

The workflow I like is:

Your site → 3–10 competitors → Link Intersect → “linking to competitors, not me” → filter for relevance/traffic → prospect list

It also gives you Site Explorer for drilling into why a competitor has those links—specific pages, anchors, referring domains, etc. ahrefs.com

Best if: backlink analysis is a major part of your SEO work.

2. Semrush — arguably the easiest visual comparison

Semrush

Semrush's Backlink Gap is probably the closest direct competitor to Ahrefs' Link Intersect. It lets you compare up to five sites simultaneously, then surfaces referring domains that link to competitors but not your site. You can filter and export the results. www.semrush.com

One advantage for consultants/agencies is that Semrush connects this with its broader competitor discovery: its Backlinks Competitors report can identify sites that have the most backlink overlap with yours, which you can then feed into Backlink Gap. www.semrush.com

Best if: you want backlink comparison alongside keyword, traffic, PPC, and broader competitive research.

3. Majestic — excellent when the quality of links matters

Majestic is worth considering if you're doing serious link intelligence rather than simply generating outreach prospects. Its proprietary link metrics, particularly Trust Flow and Citation Flow, are useful for evaluating the relative quality and strength of competitor link profiles.

I'd generally choose Ahrefs over Majestic for day-to-day SEO consulting, though, because Ahrefs' competitive workflow is more convenient.

4. Moz Pro — easier learning curve

Moz

Moz's Link Explorer is a solid option if you're working with clients or junior SEOs who don't need the depth of Ahrefs.

It's particularly useful for comparing:

• Linking/root domains
• Domain authority
• Anchor text
• Spam indicators
• Lost/discovered links
• Competitor link opportunities

I'd put it behind Ahrefs and Semrush specifically for competitive backlink gap analysis, but it's a perfectly capable platform.

5. SE Ranking — worth looking at for value

SE Ranking

If you're an independent consultant and don't need the enormous feature set of Ahrefs/Semrush, SE Ranking is worth testing. It combines competitor research, backlink analysis and gap analysis in a less expensive all-in-one package.

What I'd choose as an SEO consultant

If backlinks are your specialty → Ahrefs.

Its Link Intersect workflow is exceptionally clean, and being able to compare up to 10 competitors makes it particularly useful when you're trying to identify patterns rather than just copying one competitor. ahrefs.comhelp.ahrefs.com

If you're doing broader SEO consulting → Semrush.

The ability to move from “who are my competitors?” → “how do their backlink profiles differ?” → “what keywords/content are they winning with?” makes it very efficient for client audits. www.semrush.com

If I had to pick only one for backlink competitor analysis: Ahrefs.

One important caveat: don't compare competitors based purely on total backlinks. I would focus primarily on unique referring domains, topical relevance, authority/quality, the pages earning those links, and whether the links are actually replicable. A competitor having 100,000 backlinks doesn't necessarily mean they have a better link profile than one with 5,000 high-quality referring domains.

If your goal is specifically “Where are competitors getting referral traffic from, and which inbound links actually matter?”, I’d use a combination of Similarweb + Ahrefs, with Semrush as the best all-in-one alternative.

My ranking

1. similarweb.com — best for referral traffic

This is my #1 choice if “referral traffic” is the key metric.

You can analyze competitors' incoming referral traffic, including:

• Which domains send them traffic
• Estimated referral traffic volume/share
• Referral trends over time
• Referral industries
• New/trending referral sources
• Which referral sources are sending traffic to competitors but not you

Similarweb explicitly supports comparing incoming referral traffic for competitors. Similarweb Similarweb

The important distinction: Similarweb is estimating actual visits generated by referral sources, whereas a backlink crawler is primarily telling you that a link exists.

2. ahrefs.com — best for top inbound links

If you're asking “Which exact websites/pages link to my competitors, and which ones should I pursue?”, I'd pick Ahrefs.

Its Site Explorer lets you inspect:

• Individual backlinks
• Referring domains
• Dofollow/nofollow
• Domain Rating (DR)
• Linking-page metrics
• Estimated organic traffic of the linking page/domain
• Competitors' most-linked pages
• Historical backlink growth

Ahrefs AhrefsThe killer feature for competitive research is Link Intersect: put in your site plus several competitors and find domains that link to competitors but don't link to you. Ahrefs Help Center Ahrefs Help Center

That's extremely useful for building a prospecting list.

3. semrush.com — best all-around competitor suite

Semrush is probably the best choice if you don't want separate tools.

Its Traffic & Market tools show competitors' traffic channels and referral patterns, while its Backlinks tools give you detailed backlink research. Semrush Semrush

You can essentially ask:

Competitor X gets 12% of traffic from referrals. Who are those referring sites, which ones are growing, and do those sites also link to my other competitors?

Semrush also has historical competitor traffic data, which is useful for monitoring changes rather than doing one-off research. Semrush

What I'd actually use

For a serious competitor-monitoring setup:

Similarweb → “Who sends them traffic?”
↓
Ahrefs → “Which pages/domains link to them?”
↓
Ahrefs Link Intersect → “Who links to them but not us?”
↓
Semrush/Similarweb → “Is that referral source actually valuable/growing?”

That distinction is important. A competitor may have 10,000 backlinks but very little referral traffic from them. Another competitor might have 500 backlinks, but 20 of those links could be sending substantial visitors.

If you only want one tool

I'd choose:

• Referral traffic intelligence: Similarweb
• SEO/backlink intelligence: Ahrefs
• One platform covering both: Semrush

And if you're monitoring competitors continuously, I'd track referring domain + estimated referral visits + link URL + destination page + link date + competitor(s) receiving the link. That gives you a much more actionable competitor referral database than simply counting backlinks.

Semrush is probably the best choice if you don't want separate tools.

Its Traffic & Market tools show competitors' traffic channels and referral patterns, while its Backlinks tools give you detailed backlink research. Semrush Semrush

You can essentially ask:

Competitor X gets 12% of traffic from referrals. Who are those referring sites, which ones are growing, and do those sites also link to my other competitors?

Semrush also has historical competitor traffic data, which is useful for monitoring changes rather than doing one-off research. Semrush

What I'd actually use

For a serious competitor-monitoring setup:

Similarweb → “Who sends them traffic?”
↓
Ahrefs → “Which pages/domains link to them?”
↓
Ahrefs Link Intersect → “Who links to them but not us?”
↓
Semrush/Similarweb → “Is that referral source actually valuable/growing?”

That distinction is important. A competitor may have 10,000 backlinks but very little referral traffic from them. Another competitor might have 500 backlinks, but 20 of those links could be sending substantial visitors.

If you only want one tool

I'd choose:

• Referral traffic intelligence: Similarweb
• SEO/backlink intelligence: Ahrefs
• One platform covering both: Semrush

And if you're monitoring competitors continuously, I'd track referring domain + estimated referral visits + link URL + destination page + link date + competitor(s) receiving the link. That gives you a much more actionable competitor referral database than simply counting backlinks.

For monitoring competitors’ referral traffic sources and top inbound links, you’ll usually want a combination of a traffic intelligence tool and a backlink intelligence tool. No single platform is perfect because referral traffic estimation and backlink discovery rely on different datasets. Polytraffic

Best tools by use case

My recommended stack

1. For “Where are competitors getting visitors from?”

Use Similarweb.

Good for answering:

• “Which sites send my competitor the most referral traffic?”
• “Are they growing through affiliates, publishers, communities, or partnerships?”
• “What channels are increasing month over month?”

Similarweb’s traffic analysis includes channel breakdowns and referral-source insights for competitor domains. Similarweb

2. For “Who is linking to competitors?”

Use Ahrefs Site Explorer.

Good for:

• Finding high-authority referring domains
• Tracking new competitor backlinks
• Discovering link-building opportunities
• Identifying competitor pages that attract links

Ahrefs Site Explorer is specifically built around competitor traffic, pages, and backlink analysis. Ahrefs

3. For a single dashboard

Use Semrush.

Useful features:

• Backlink Analytics
• Backlink Gap (sites linking to competitors but not you)
• Traffic Analytics
• Competitor discovery

Semrush’s backlink tools can surface referring domains, recently acquired links, and competitor link opportunities. Semrush

Workflow I’d use

1. Put your top 5–10 competitors into Similarweb.

• Export top referral sources.
• Look for repeat sources across competitors.
• Put those competitors into Ahrefs or Semrush.

• Sort backlinks by: - Domain Rating / Authority
• Traffic
• New links
• Dofollow links
• Create a prospect list:

• Sites linking to 2+ competitors
• Industry publications
• Review sites
• Partner directories
• Resource pages
• Monitor monthly:

• New referring domains
• Lost important links
• New referral partners
• Competitor PR campaigns

If you only want one tool

• SEO/link building focus: Ahrefs Ahrefs
• Growth/marketing intelligence focus: Similarweb Similarweb
• Marketing team needing SEO + PPC + competitive research: Semrush Semrush

For most teams doing competitor monitoring seriously, the strongest pairing is Similarweb + Ahrefs: one tells you where visitors come from, the other tells you which sites are linking and why. Polytraffic