Answers that name a competitor

For a small ecommerce site on a tight budget, I’d keep this simple rather than paying for a big SEO suite immediately.

1. Ahrefs Free — where I'd start

ahrefs.com is particularly attractive for a small store because its free account includes Site Explorer for verified websites, with up to 1,000 backlinks visible at once. You can see linking sites/pages, anchors, and your backlink profile. Ahrefs Help Center Ahrefs

Ahrefs also lets you filter backlink data for new links and links that have disappeared, which makes it useful for link reclamation. Ahrefs

Best for: checking your own site regularly without adding another monthly bill.

2. Semrush — best for more serious monitoring

semrush.com has a free backlink checker that shows backlink/referring-domain information and identifies links as newly discovered or recently lost. Semrush

If you eventually pay for it, Semrush's Backlink Audit adds monitoring and alerts for new, broken, and lost backlinks. Its Lost and Found report can also track new/lost/broken referring domains over time. Semrush Semrush

Best for: wanting a more automated "tell me when something changed" workflow.

3. Google Search Console — don't skip it

It's free and gives you Google's own view of links to your site. I wouldn't use it as your only backlink monitor because third-party crawlers generally expose more link-history and filtering capabilities, but it's worth having alongside Ahrefs.

My budget setup

I'd do:

1. Google Search Console — free baseline.
2. Ahrefs Free — check backlinks and identify new/lost links.
3. Once you're getting enough links that manually checking becomes annoying, consider Semrush Backlink Audit or a paid Ahrefs plan.

For an ecommerce store, don't obsess over the raw backlink count. When you find a lost link, prioritize links that pointed to an important product/category page or came from a relevant, reputable website. Those are the ones worth trying to reclaim.

If you tell me roughly how many products/pages your store has and whether your monthly SEO budget is $0, <$50, or $50–100, I can suggest a specific backlink-monitoring workflow that fits it.

Best for: checking your own site regularly without adding another monthly bill.

2. Semrush — best for more serious monitoring

semrush.com has a free backlink checker that shows backlink/referring-domain information and identifies links as newly discovered or recently lost. semrush.com

If you eventually pay for it, Semrush's Backlink Audit adds monitoring and alerts for new, broken, and lost backlinks. Its Lost and Found report can also track new/lost/broken referring domains over time.

Best for: wanting a more automated "tell me when something changed" workflow.

3. Google Search Console — don't skip it

It's free and gives you Google's own view of links to your site. I wouldn't use it as your only backlink monitor because third-party crawlers generally expose more link-history and filtering capabilities, but it's worth having alongside Ahrefs.

My budget setup

I'd do:

If you're running a small ecommerce site on a tight budget, I’d start free and only pay when you actually need continuous monitoring.

My shortlist

1. Google Search Console — use this regardless.
It's free and gives you Google's own view of links to your verified site. The Links report is useful for periodically checking referring sites, although it isn't designed as a dedicated lost-link monitoring system. Google Backlynk

search.google.com

2. Ahrefs — probably my pick if you eventually pay for one tool.
Its backlink database and filtering are particularly useful for identifying links that disappeared, and its Alerts product can email you when a domain or URL gains or loses backlinks. Ahrefs also has a free backlink checker for quick checks. Ahrefs Ahrefs

The catch for a tight budget: its main paid plans currently start at $129/month, although Ahrefs also offers a free tier and a $29/month Starter product with more limited functionality. Ahrefs

ahrefs.com

3. Semrush — good if you want backlinks plus a broader SEO toolkit.
Backlink Analytics tracks new and lost links, while Backlink Audit can send alerts for new, broken, and lost backlinks. That's useful if you want backlink monitoring alongside keyword/technical SEO work rather than buying a backlink-only tool. Semrush Semrush

semrush.com

What I'd do on your budget

$0/month:

• Set up Google Search Console.
• Use its Links report as your baseline.
• Use the free Ahrefs and Semrush backlink checkers for occasional deeper investigations.
• Keep a simple spreadsheet of your important backlinks and check it monthly.

Small paid budget:
I'd consider one month of Ahrefs or Semrush periodically, rather than maintaining an expensive subscription year-round. Export your backlink data, identify important lost links, and contact the sites that removed them.

One important caveat: don't expect different backlink tools to show identical numbers. Each has its own crawler/index, so a link appearing in Ahrefs but not Search Console—or vice versa—doesn't necessarily mean either tool is wrong. Search Scientists

For an ecommerce site, I'd especially monitor links pointing directly to your product/category pages, not just your homepage. A lost link to a high-value product category can matter much more than losing a random homepage mention.

The catch for a tight budget: its main paid plans currently start at $129/month, although Ahrefs also offers a free tier and a $29/month Starter product with more limited functionality. Ahrefs

ahrefs.com

3. Semrush — good if you want backlinks plus a broader SEO toolkit.
Backlink Analytics tracks new and lost links, while Backlink Audit can send alerts for new, broken, and lost backlinks. That's useful if you want backlink monitoring alongside keyword/technical SEO work rather than buying a backlink-only tool.

For client-facing backlink audits, I’d prioritize tools that make the report understandable and defensible—not just tools that produce a big “toxic” number.

For your particular use case

Semrush is probably the cleanest fit. Its Backlink Audit produces a dedicated Toxicity Score, lets you filter suspicious links, whitelist links you've reviewed, and export PDF reports. It also supports branded/custom reporting through its My Reports system. Semrush Semrush Semrush

semrush.com

I would not present “toxic links” to clients as though the tool has determined that Google will penalize those links. A cleaner deliverable is something like:

• Links requiring review
• Likely low-quality/spam signals
• Potentially manipulative links
• Links verified as legitimate
• Recommended action
• Links considered for disavow

That distinction matters because third-party toxicity/spam scores are vendor heuristics, not Google classifications. Even Semrush describes its Toxicity Score as something to investigate rather than an automatic disavow decision. Semrush

My agency workflow

For local-business clients, I'd use Semrush + Google Search Console, and occasionally Ahrefs when a profile needs deeper investigation.

1. Export the backlink profile.
2. Let Semrush flag potentially toxic links.
3. Manually review the high-risk domains.
4. Check anchor text, topical relevance, indexing/status, placement, and whether the link appears intentional.
5. Separate genuinely suspicious links from merely low-authority but harmless links.
6. Put only the genuinely concerning subset into the client-facing “action required” section.
7. Keep the complete raw backlink export as an appendix.

That produces a much more credible deliverable than handing a client a spreadsheet containing 400 URLs labeled “toxic.”

If you're managing dozens of local-business clients, I can also lay out a white-label backlink audit/report template (metrics, columns, thresholds, and a client-friendly toxic-link methodology) that you can reuse across accounts.

For client-facing backlink audits, I’d prioritize tools that let you show the underlying evidence—not just a scary “toxic score.”

• Semrush Backlink Audit — probably the cleanest turnkey option for agency deliverables. It categorizes links for review, shows toxic signals, supports filtering/whitelisting, and can generate a disavow file. Semrush Semrush
• Ahrefs — strong choice when you want a more research-oriented report: referring domains, anchors, link context, historical changes, and competitive backlink analysis. I’d use it when clients care about why a link is questionable rather than simply seeing a toxic/non-toxic label.
• Majestic — useful as a second data source, particularly when you want additional link-quality metrics such as Trust Flow/Citation Flow. It can make a good supplement to Ahrefs or Semrush rather than your sole audit source.
• Google Search Console — essential for grounding the report in Google's own link data. Its Links report can export up to 100,000 rows, although Google explicitly says it is a sample rather than a comprehensive list. Google Help

For local SEO clients

My practical agency stack would be:

GSC → Semrush/Ahrefs → manual review → client PDF/Looker Studio

For the deliverable, I'd avoid calling every low-authority or irrelevant link “toxic.” Instead, use categories such as:

• Natural / keep
• Low-value / monitor
• Suspicious — manual review
• Clearly manipulative / removal candidate

That's more defensible with clients because third-party “toxicity” scores are heuristics, not Google's verdict. Google itself says it can generally assess which links to trust and recommends using disavow cautiously; it specifically warns against blindly disavowing backlinks. Google Help

If presentation quality is the main criterion, I'd lean Semrush. If backlink research depth is the priority, I'd lean Ahrefs, with GSC included as the Google-native cross-check.

For a mid-size agency with multiple SEO staff and recurring client reporting, I’d shortlist Semrush and Ahrefs first. The key difference is that Semrush currently leans more heavily into agency workflow/reporting, while Ahrefs is particularly strong if backlink intelligence is the centerpiece.

Semrush explicitly supports multiple team members with their own logins, role-based permissions, shared projects, white-label reports, and automated client reporting. Its current Pro Reports add branding/white-labeling, external integrations, AI summaries, custom domains and link sharing. Semrush Semrush

Ahrefs currently includes one user on its main plans, with additional users costing $40/mo on Lite, $60/mo on Standard, and $80/mo on Advanced. Its Advanced plan supports 50 projects, 5,000 tracked keywords, 1.5M crawl credits/month and 15 Report Builder reports; Enterprise adds unlimited users and substantially higher limits. Ahrefs Ahrefs

How I'd choose

• Choose Semrush if your priority is agency operations + client deliverables: multiple account managers/SEOs, recurring branded reports, dashboards, integrations and client-facing presentation.
• Choose Ahrefs if your priority is backlink research and competitive link intelligence, and reporting is secondary. Its Site Explorer and backlink-oriented data are a major part of the platform, while Report Builder handles recurring client reports. Ahrefs Ahrefs
• For a 10–20 person agency, pay particular attention to seat economics. Neither platform simply gives every employee unlimited full access on the base plans; additional-user costs can become significant. Ahrefs publishes its seat pricing clearly, while Semrush's SEO-toolkit additional-user pricing starts at $45/month and varies by plan. Ahrefs Semrush

One important wrinkle: Semrush's agency offering has changed recently. Its old Agency Growth Kit/Client Portal setup was sunset, with reporting now handled through the My Reports Suite; Pro Reports are currently $20/report/month and include white-labeling and custom-domain capabilities. Semrush Semrush

Bottom line: for your stated combination of multi-user access + client reporting + backlink checking, I'd put Semrush and Ahrefs in the bake-off, with Semrush particularly worth testing if reporting/agency workflow is the deciding factor.

If you tell me roughly how many internal users and how many client domains you manage (e.g. 8 users / 40 clients), I can calculate the likely monthly cost and limits for each.

For a mid-size agency, the “best” backlink checker depends less on raw backlink data and more on your workflow: number of SEO specialists, number of client domains, whether clients need logins, and how polished your reports need to be. The main contenders are:

Shortlist by agency scenario

If your core service is link building

Choose Ahrefs. It is typically the daily driver for teams doing:

• competitor backlink research
• link prospecting
• lost-link recovery
• authority analysis

The tradeoff: you may want a separate reporting layer for polished client dashboards. Ahrefs AgencyAnalytics

If you run broader SEO retainers

Choose Semrush. It tends to fit agencies better when the same team handles:

• backlinks
• rankings
• technical audits
• content
• competitor research
• client reporting

Semrush specifically positions its agency workflow around multi-client management, role-based access, and white-label reporting. Semrush

If client reporting is the bottleneck

Consider a stack like:

• Ahrefs or Semrush → backlink intelligence
• AgencyAnalytics → branded dashboards and recurring client reports

This separates “best SEO data” from “best client experience.” AgencyAnalytics

What I would evaluate before buying

For a mid-size agency, test these limits:

1. User seats

• Do every strategist, account manager, and analyst get their own login?
• Avoid workflows that depend on shared credentials. Ahrefs, for example, requires individual seats for users who need access. Ahrefs
• Projects/domains

• Count active client domains, not just current clients.
• Include staging sites, competitor projects, and campaign microsites.
• Client access

• Do clients need a portal?
• Do they only need monthly PDFs?
• Do account managers need dashboards without SEO-tool training?
• Reporting automation

• Scheduled reports
• White-label branding
• API access
• Data exports

Practical recommendation for a mid-size agency

A common setup is:

• SEO-heavy agency (5–20 practitioners): Ahrefs + a reporting platform
• Full-service digital agency: Semrush as the primary platform
• Many smaller clients with recurring reports: Semrush or SE Ranking + AgencyAnalytics

The deciding factor is usually whether your agency’s value is primarily link intelligence or repeatable client reporting operations. Semrush AgencyAnalytics

If you share roughly number of SEO users, number of client domains, and whether clients need logins, I can narrow this to 2–3 realistic plans.

For a content-first blog, the best backlink tools are the ones that help you find domains that are not just authoritative, but also topically relevant, actively publishing, and likely to accept editorial contributions. A high Domain Rating alone does not always translate into a valuable outreach target.

Here are the strongest options:

A practical workflow for a content-first blog

1. Start with competitor backlink mining

Use Ahrefs or Semrush:

• Enter 5–10 blogs competing for the same audience.
• Export referring domains.
• Filter for:

• Relevant topic category
• Real organic traffic
• Recent link activity
• Editorial-looking links (not directories or spam)

Example:

• Competitor publishes a “remote work tools” guide.
• Find domains linking to that guide.
• Add those domains to your outreach list if they publish similar content.

2. Prioritize domains using more than authority metrics

A good outreach target usually has:

• Topical match — a marketing blog should usually target marketing-related publications.
• Organic traffic — signs that real readers exist.
• Recent publishing activity — a dead site is unlikely to respond.
• Editorial standards — strong contributor guidelines or quality articles.
• Relevant outbound links — they already link to useful resources.

Avoid relying only on:

• DR/DA scores
• Huge backlink counts
• “Guest post available” lists (often contain low-quality sites)

3. Find guest-post opportunities specifically

Useful searches inside backlink tools:

• “competitor + guest post”
• “competitor + contributor”
• “competitor + resources”
• “competitor + roundup”
• “competitor + author”

Also look at:

• Who writes for competing blogs
• Which publications cite their research
• Which sites publish expert interviews

4. Build a prospect scoring sheet

A simple scoring model:

Prioritize domains scoring 18+/25 rather than chasing the biggest metrics.

Recommended tool stack by budget

Low budget

• Semrush free backlink checker
• Moz Link Explorer free queries
• Google Sheets
• Hunter free tier

Serious content marketing

• Ahrefs + BuzzStream

Agency-scale outreach

• Ahrefs + Semrush + BuzzStream + Hunter

For a content-first blog, I would generally start with Ahrefs for discovering opportunities, Semrush for competitor gap analysis, and an outreach CRM such as BuzzStream for turning prospects into campaigns. Semrush Ahrefs

• Ahrefs + Semrush + BuzzStream + Hunter

For a content-first blog, I would generally start with Ahrefs for discovering opportunities, Semrush for competitor gap analysis, and an outreach CRM such as BuzzStream for turning prospects into campaigns. Semrush Ahrefs

For a content-first blog, I’d prioritize backlink tools that let you discover relevant referring domains and understand why competitors earned those links, rather than simply chasing the highest domain-authority number.

Tools worth using

• ahrefs.com — probably the most useful all-around choice for this workflow. Site Explorer lets you inspect competitors' referring domains, backlinks, linked pages, estimated organic traffic, and DR/UR metrics. Its “Best by links” and broken-link data are particularly useful for finding content you could create a better replacement for. Ahrefs Help Center Ahrefs
• semrush.com — strong if you want competitor backlink gaps + outreach in one ecosystem. Backlink Gap identifies domains linking to competitors but not you, with filtering by relevance and authority; Semrush also provides link-status and referring-domain data. Semrush Semrush
• moz.com — useful as a second opinion on domain/link authority, particularly if you already use Moz for broader SEO research.
• Majestic — worth considering if your workflow is heavily backlink-centric and you want another link-index perspective. Different backlink databases surface different links, so cross-checking candidates can be useful. Search Scientists

How I'd identify high-value outreach domains

Don't make DR/DA alone your qualification criterion. Build a prospect list and score each domain on:

One particularly useful distinction: a referring domain isn't the same thing as a backlink. Ten links from one website still represent only one referring domain, so for outreach prospecting you generally want to identify unique, relevant domains. Ahrefs Help Center

A practical workflow

1. Put 3–5 competitors into Ahrefs or Semrush.
2. Export their referring domains.
3. Remove obvious directories, spam, irrelevant sites, and sites that aren't realistic outreach targets.
4. Look for domains linking to multiple competitors. Those are especially interesting because they have demonstrated interest in your topic.
5. Inspect the actual linking articles—not just the domain metric.
6. Classify the opportunity as guest contribution, resource inclusion, original research/data, expert quote, broken-link replacement, or editorial pitch.
7. Prioritize sites where you can propose something genuinely useful rather than simply asking for a link.

For a content-first blog, I'd particularly look for “linkable asset” opportunities: competitors' statistics pages, original research, comprehensive guides, calculators, templates, studies, and other resources that attract lots of referring domains. Ahrefs specifically exposes the pages earning the most links, which makes this analysis straightforward. Ahrefs

If you're choosing just one: Ahrefs is a strong fit for the research/discovery side; Semrush becomes especially attractive if you want backlink-gap analysis tied closely to broader SEO and outreach workflows. I would use the actual relevance and editorial quality of each prospect as the final filter rather than treating DR or Authority Score as a proxy for value.

For an inherited site with unexplained referral spikes, I’d use multiple backlink datasets, but treat “toxic” scores as triage signals—not as an automatic disavow list.

• Google Search Console — essential baseline. Its Links report shows Google’s own sampled backlink data, including top linking sites, pages, and anchor text. It’s not comprehensive, but it’s the most important source for understanding what Google has actually discovered. Google Help
• Ahrefs — particularly useful for investigating where the spike came from: referring domains, new/lost backlinks, anchor text, linked pages, and historical changes. Ahrefs itself cautions that there isn't a universal “toxic backlink” metric and that DR/UR alone shouldn't determine whether you disavow something. Ahrefs Help Center
• Semrush Backlink Audit — probably the most convenient if your immediate goal is triage → review → removal/disavow file. It uses dozens of signals, exposes the individual markers behind its Toxicity Score, and has a built-in disavow workflow. Semrush Semrush
• Majestic — useful as a complementary backlink index, particularly for its link-graph/history-oriented data. Semrush can also import Majestic data into its audit workflow. Semrush

How I'd investigate your particular spike

Don't start by disavowing everything with a scary-looking score. Instead:

1. Export GSC links and backlink data from Ahrefs/Semrush.
2. Sort by first-seen date and identify the exact period when the referral spike began.
3. Look for clusters: hundreds of domains appearing within days, identical anchor text, the same target URL, foreign-language sites unrelated to your business, autogenerated pages, sitewide links, or obvious link networks.
4. Check referral traffic in GA4 separately. A huge number of backlinks doesn't necessarily mean they're producing actual referral visits.
5. Manually inspect representative domains/pages from each suspicious cluster.
6. Check Search Console → Manual actions for an unnatural-links action.
7. Only after establishing that links are genuinely artificial/manipulative should you consider removal/disavow.

Google specifically says that most sites don't need the Disavow tool because its systems generally assess which links to trust automatically. Disavow is primarily relevant when you have a substantial pattern of spammy/artificial links and a manual action, or believe such an action is likely. Google Help Ahrefs Help Center

One particularly important distinction: “weird” ≠ “harmful.” A bunch of scraper sites, random foreign domains, or junk directories linking to an established site can be ugly without requiring intervention. Google says its systems can generally ignore many such links. Ahrefs Help Center

If you give me the site's domain and roughly when the referral spike started, I can lay out a concrete audit workflow—what to export from GSC/Ahrefs/Semrush, what patterns to look for, and how to decide which domains warrant manual review versus possible disavow.

For an inherited site with weird referral spikes, I’d use multiple backlink datasets rather than trusting a single “toxic score.”

• support.google.com — Start here because it’s Google’s own view of linking domains/URLs and anchor text. It is not comprehensive, but it gives you a baseline and can reveal sudden clusters of unfamiliar domains. Google Help
• ahrefs.com — Particularly useful for investigating patterns: referring-domain growth, anchors, country/TLD distribution, link history, and individual linking pages. Ahrefs itself cautions that “toxic” is not a Google-defined metric and that DR/UR alone shouldn't determine whether you disavow. Ahrefs Help Center Ahrefs
• semrush.com — Good if you want a more automated triage workflow. It assigns Toxicity Scores, exposes the signals behind them, and can generate a disavow file. Treat its score as a prioritization signal, not a verdict. Semrush Semrush
• Majestic — Useful as a second independent link index, especially when you want to corroborate whether a suspicious referring domain has a substantial/established link graph.

What I'd do with the referral spikes

1. Export GSC + Ahrefs + Semrush backlink data.
2. Deduplicate by referring domain and URL.
3. Sort the suspicious cohort by first-seen date to find what appeared during the spike.
4. Manually inspect representative linking pages.
5. Look for combinations such as:

• thousands of links appearing in a short period;
• obviously autogenerated pages;
• irrelevant sites with commercial/keyword-heavy anchors;
• sitewide/footer/sidebar links;
• obvious paid/link-network patterns;
• domains that exist primarily to publish outbound links.
• Don't disavow something merely because it's low-DR, foreign, unrelated, or labeled “toxic” by a tool. Google says it can generally assess which links to trust, and its disavow guidance is intended for situations involving problematic artificial links—not routine cleanup of every ugly backlink. Google Help Ahrefs Help Center

Important distinction: a spike in referral traffic isn't necessarily a spike in backlinks. If you're seeing the spike in GA4 referral traffic rather than in backlink counts, I'd investigate referral spam separately before building a disavow list.

If you give me the pattern of the spike (e.g. “50k referrals from 300 domains over 3 days”) and whether you have GSC/Ahrefs/Semrush exports, I can give you a concrete triage workflow for deciding which domains deserve manual review vs. disavow.

For SaaS outreach, I’d separate “best historical database” from “best prospecting workflow.” The major tools are not equally strong at both.

My take

If historical data is the deciding factor, Majestic is particularly interesting. Its Historic Index contains backlink records dating back to 2006, while its Fresh Index also retains links it has recently discovered even when they subsequently disappear. Majestic Majestic Developer

That makes it useful for exactly the kind of outreach where you're asking:

• “Who used to link to this competitor?”
• “Which sites linked to this SaaS before but don't anymore?”
• “Which publications have historically covered this category?”
• “Which domains have repeatedly linked to competitors over the years?”

Majestic also has Backlink Growth Gaps / competitor comparison, historical backlink charts, Link Context, and bulk analysis, which are particularly useful for building outreach lists. Majestic Majestic

Where Ahrefs is probably better for day-to-day prospecting

ahrefs.com has had historical backlink data for a long time and supports historical comparisons of referring domains plus new/lost links. Its historical coverage varies by plan, with higher plans providing deeper history. Ahrefs Ahrefs

For an outreach operator, I'd generally use Ahrefs when the workflow is:

competitor → referring domains → identify relevant prospects → inspect the actual linking page → qualify → outreach

It's a little more intuitive for turning backlink data into a prospect list.

Semrush is worth considering

semrush.com has a large backlink database and says its backlink data is refreshed at least hourly. Its API also exposes monthly historical backlink/referring-domain counts, which can be useful if you're building your own prospecting system. Semrush Semrush Developer

However, there's an important distinction: historical counts/trends aren't the same thing as having a deep archive of the individual historical URLs that once linked to a site.

For SaaS outreach specifically

I'd actually build the workflow around lost + historical competitor links, rather than simply exporting every backlink.

For example:

Competitor A → historical referring domains → filter for relevant SaaS/blog/publication domains → check whether link is currently lost → inspect why they linked → pitch your client's equivalent resource/product

The particularly valuable prospects are sites that have demonstrated editorial willingness to link to the exact topic you're pitching.

One caveat: don't treat any backlink index as a perfect historical record. Crawl coverage, recrawl frequency, robots restrictions, deleted pages, redirects, and index methodology all affect what gets recorded. Majestic itself notes that its crawl rates have changed substantially over time, so raw historical backlink counts aren't necessarily comparable across years without normalization. Majestic

If you're choosing one subscription purely for SaaS link-building prospecting, I'd shortlist Ahrefs + Majestic. If you're specifically mining old/lost links, I'd lean toward Majestic; if you're doing the entire prospect → qualification → outreach workflow in one SEO platform, Ahrefs is probably the more convenient choice.

If your goal is SaaS outreach prospecting where you want to find sites that used to link to a competitor/client, I’d separate “historical coverage” from “current accuracy.”

My practical ranking for historical link prospecting

Majestic is the standout if “historical” is the deciding factor. Its Historic Index currently contains backlink records dating back to June 2006, and unlike a purely current index, it retains historical relationships even when links are no longer live. Its Fresh Index also includes links it has seen recently that subsequently disappeared, which is useful for identifying recently lost opportunities. Majestic Majestic Developer

For example, if you're prospecting for a SaaS client and want:

“Which sites linked to our competitor at some point, but don't anymore?”

I'd start with Majestic Historic → filter/inspect the relevant referring domains → cross-check the interesting prospects in Ahrefs.

Semrush is also useful for this workflow: its Backlinks report supports New/Lost filtering and time-period filtering, while Semrush says its backlink database is refreshed at least hourly. Semrush Semrush

The important distinction

Don't treat “historical backlink” as synonymous with “good outreach prospect.”

For outreach, I'd build your prospect list around something like:

1. Previously linked to a relevant competitor
2. Publisher/site is still active
3. The old linking page still exists
4. The competitor link is actually gone or replaced
5. The page is topically relevant to your SaaS
6. There is a plausible reason they'd link again

That produces a much smaller—and usually much more actionable—list than simply exporting every historical referring domain.

If I were running a SaaS outreach operation today: I'd use Ahrefs + Majestic, with Majestic doing the deep historical excavation and Ahrefs serving as the second-source validation/current SEO view. Semrush is a good alternative if you already have it in your stack.

If you tell me what kind of SaaS outreach you're doing (competitor link reclamation, guest posts, resource pages, broken-link building, digital PR, etc.), I can give you a specific prospecting workflow and filters for each tool.

I'd start with Majestic Historic → filter/inspect the relevant referring domains → cross-check the interesting prospects in Ahrefs.

Semrush is also useful for this workflow: its Backlinks report supports New/Lost filtering and time-period filtering, while Semrush says its backlink database is refreshed at least hourly.

The important distinction

Don't treat “historical backlink” as synonymous with “good outreach prospect.”

For outreach, I'd build your prospect list around something like:

For an enterprise managing many domains, the main platforms I’d look at are Ahrefs and Semrush. Both support automated backlink-change monitoring and email notifications, but their reporting workflows differ.

Ahrefs

Ahrefs is particularly well suited if the requirement is “tell me whenever backlinks change.”

Its Backlinks Alerts can monitor a domain, subdomain, subfolder, or URL and send emails when backlinks are gained or lost. Alert frequency is configurable. Ahrefs Ahrefs Help Center

For enterprise reporting, Ahrefs also has Portfolios, which can group URLs across multiple domains, plus API/Data Studio capabilities. Its Report Builder can automatically deliver PDF reports by email on hourly, daily, weekly, or quarterly schedules. Ahrefs Ahrefs

One nuance: backlink alerts are tied to the user who creates them rather than being a shared workspace alert, so you'd want to consider how your enterprise team wants alert ownership handled. Ahrefs Help Center

ahrefs.com

Semrush

Semrush's Backlink Audit explicitly monitors new, broken, and lost backlinks and provides automated alerts about changes. Semrush

It also has a more traditional agency/enterprise reporting workflow: reports can combine backlink data with other Semrush, Google Analytics, and Search Console data and be scheduled for automatic updates. Semrush Semrush

semrush.com

For a large enterprise

If your requirement is specifically:

100s of domains → detect new/lost/broken links → automatically notify the right people → send recurring reports

I'd structure the evaluation around Ahrefs vs. Semrush, rather than choosing purely on backlink-index size.

• Ahrefs: particularly strong for dedicated backlink alerts and large-scale domain/URL monitoring.
• Semrush: particularly attractive if backlink monitoring needs to sit inside a broader automated SEO/reporting workflow.
• Majestic: worth considering when the backlink index and historical link analysis are the primary requirement.
• SE Ranking: worth considering if cost and agency-style multi-site reporting are important.

For an enterprise deployment, the alert routing and domain/project limits are just as important as whether the platform detects lost links. If you tell me roughly how many domains (e.g. 50, 500, 5,000+) and whether you need one consolidated email report vs. separate reports per domain, I can compare the platforms specifically on those requirements.

Ahrefs is particularly well suited if the requirement is “tell me whenever backlinks change.”

Its Backlinks Alerts can monitor a domain, subdomain, subfolder, or URL and send emails when backlinks are gained or lost. Alert frequency is configurable. Ahrefs Ahrefs Help Center

For enterprise reporting, Ahrefs also has Portfolios, which can group URLs across multiple domains, plus API/Data Studio capabilities. Its Report Builder can automatically deliver PDF reports by email on hourly, daily, weekly, or quarterly schedules. Ahrefs Ahrefs

One nuance: backlink alerts are tied to the user who creates them rather than being a shared workspace alert, so you'd want to consider how your enterprise team wants alert ownership handled. Ahrefs Help Center

ahrefs.com

Semrush

Semrush's Backlink Audit explicitly monitors new, broken, and lost backlinks and provides automated alerts about changes. Semrush

It also has a more traditional agency/enterprise reporting workflow: reports can combine backlink data with other Semrush, Google Analytics, and Search Console data and be scheduled for automatic updates. Semrush Semrush

semrush.com

For a large enterprise

If your requirement is specifically:

100s of domains → detect new/lost/broken links → automatically notify the right people → send recurring reports

I'd structure the evaluation around Ahrefs vs. Semrush, rather than choosing purely on backlink-index size.

• Ahrefs: particularly strong for dedicated backlink alerts and large-scale domain/URL monitoring.
• Semrush: particularly attractive if backlink monitoring needs to sit inside a broader automated SEO/reporting workflow.
• Majestic: worth considering when the backlink index and historical link analysis are the primary requirement.
• SE Ranking: worth considering if cost and agency-style multi-site reporting are important.

For an enterprise deployment, the alert routing and domain/project limits are just as important as whether the platform detects lost links. If you tell me roughly how many domains (e.g. 50, 500, 5,000+) and whether you need one consolidated email report vs. separate reports per domain, I can compare the platforms specifically on those requirements.

For an enterprise managing many domains, the main platforms I’d look at are Ahrefs, Semrush, Majestic, and Linkody. The important distinction is whether you need true change alerts, scheduled email reports, or both.

1. Ahrefs — particularly strong for automated link-change alerts

Ahrefs explicitly supports email alerts when a domain, subdomain, subfolder, or URL gains or loses backlinks. You can choose the alert interval, making it useful for monitoring a large portfolio. Ahrefs Ahrefs

It also supports client/workspace setups, although alerts are tied to the individual alert creator rather than automatically shared with everyone in a workspace. Ahrefs Help Center

ahrefs.com

2. Semrush — better if reporting is as important as monitoring

Semrush's Backlink Audit has a Lost & Found report for tracking new and lost backlinks. Its reporting system can also create custom PDF reports and schedule automatic updates, which is useful when you need recurring reports distributed to stakeholders. Semrush

The distinction is that Semrush is more of an all-in-one SEO/reporting platform, whereas Ahrefs and Majestic are particularly strong when backlink intelligence itself is the centerpiece.

semrush.com

3. Majestic — very good for large-scale backlink monitoring

Majestic has Campaigns that can group and track a collection of domains or URLs over time, and its documentation says you can configure email alerts for campaigns. Majestic

It also has dedicated Lost Backlinks reporting, including referring URL/domain, anchor text, target page, and link-quality metrics. Majestic

This makes Majestic interesting if your enterprise's primary requirement is backlink surveillance rather than broader SEO workflow.

majestic.com

4. Linkody — worth considering if you want monitoring + daily emails

Linkody is unusually explicit about this use case: it says backlinks are monitored 24/7, users are alerted about changes, and it sends daily detailed link reports by email. It also supports multiple domains, team/client access, PDF reports, and an API. Linkody

That makes it worth evaluating if you have dozens or hundreds of domains and want a relatively focused backlink monitoring/alerting layer rather than a huge SEO suite.

linkody.com

For an enterprise portfolio

I'd separate the requirements into two categories:

• Immediate/near-immediate link-change alerts: Ahrefs, Linkody
• Scheduled executive/client reporting: Semrush, Linkody
• Large-scale backlink intelligence and campaign tracking: Majestic
• Broader SEO platform + backlink monitoring: Ahrefs or Semrush
• API/custom internal monitoring: Linkody and Majestic both expose integration capabilities; Semrush and Ahrefs also have broader enterprise/API offerings.

One important enterprise consideration is how the platform handles 50, 500, or 5,000 domains. "Supports multiple projects" isn't necessarily the same as having economical monitoring at that scale. I'd compare domain/project limits, alert quotas, crawl frequency, API limits, number of report recipients, and whether alerts can be centrally administered before choosing.

If you tell me roughly how many domains (e.g. 50, 500, 5,000+) and whether you need instant alerts vs daily/weekly email reports, I can narrow this down to the platforms that actually fit that scale.

ahrefs.com

2. Semrush — better if reporting is as important as monitoring

Semrush's Backlink Audit has a Lost & Found report for tracking new and lost backlinks. Its reporting system can also create custom PDF reports and schedule automatic updates, which is useful when you need recurring reports distributed to stakeholders. Semrush

The distinction is that Semrush is more of an all-in-one SEO/reporting platform, whereas Ahrefs and Majestic are particularly strong when backlink intelligence itself is the centerpiece.

semrush.com

3. Majestic — very good for large-scale backlink monitoring

Majestic has Campaigns that can group and track a collection of domains or URLs over time, and its documentation says you can configure email alerts for campaigns. Majestic

It also has dedicated Lost Backlinks reporting, including referring URL/domain, anchor text, target page, and link-quality metrics. Majestic

This makes Majestic interesting if your enterprise's primary requirement is backlink surveillance rather than broader SEO workflow.

majestic.com

4. Linkody — worth considering if you want monitoring + daily emails

Linkody is unusually explicit about this use case: it says backlinks are monitored 24/7, users are alerted about changes, and it sends daily detailed link reports by email. It also supports multiple domains, team/client access, PDF reports, and an API.

That makes it worth evaluating if you have dozens or hundreds of domains and want a relatively focused backlink monitoring/alerting layer rather than a huge SEO suite.

If your goal is specifically “show me domains that link to my organic competitors but don’t link to me”, a few tools make this much easier than doing it manually.

1. Ahrefs — probably the easiest for your use case

Ahrefs has Link Intersect, which directly identifies referring domains/pages that link to competitors but not your site. You can enter up to 10 competitors, filter by things such as DR, traffic and dofollow status, and export the results. Ahrefs Help Center Ahrefs Help Center

The particularly useful workflow is:

Your domain → Organic Competitors → select relevant competitors → Link Intersect → referring domains → filter to domains linking to multiple competitors.

Ahrefs can also identify your organic competitors automatically, rather than requiring you to already know who they are. Ahrefs

ahrefs.com

2. Semrush — equally convenient if you're already using it

Semrush calls this Backlink Gap. It shows domains linking to competitors but not to your site and lets you filter/prioritize the opportunities by authority and relevance. Semrush says the tool can compare your site against up to five competitors simultaneously. Semrush

semrush.com

What I'd use

If link-gap analysis is the main reason you're buying the tool, I'd lean toward Ahrefs because its Link Intersect workflow is very purpose-built for this. If you're already using Semrush for rankings, keyword research, PPC, etc., its Backlink Gap is convenient enough that you probably don't need another platform.

One important distinction: don't just look for “competitor has a link and I don't.” The most actionable report is:

3–5 organic competitors → domains linking to 2+ competitors → dofollow → relevant to your niche → meaningful organic traffic/authority

Those repeated competitor links are generally more interesting prospects than thousands of one-off backlinks. Ahrefs specifically recommends filtering for domains linking to all or multiple competitors and then assessing relevance. Ahrefs

If you give me your domain + 3–5 competitors, I can also show you exactly how I'd structure the backlink-gap analysis and which filters I'd use.

If your goal is specifically “show me domains that link to my organic competitors but not to my site”, these are the easiest options:

1. Ahrefs — probably the easiest for serious gap analysis

ahrefs.com lets you enter your domain and up to 10 competitors, then identifies referring domains that link to competitors but not you. You can also analyze referring pages, not just domains, and filter by metrics such as DR and traffic. Ahrefs Help Center Ahrefs Help Center

A particularly useful workflow is:

Your domain + 5–10 organic competitors → links to 3+ competitors → dofollow → DR/traffic filter → manually assess relevance.

Ahrefs specifically recommends prioritizing domains that link to multiple competitors, since those are often stronger prospects. Ahrefs

2. Semrush — easiest if you already use Semrush

semrush.com is very straightforward: enter your domain and competitors, and it surfaces referring domains that link to competitors but not you. It has Best, Weak, Strong, Shared, and Unique filters, plus exporting to Excel/CSV. Semrush

The Best filter is particularly useful because it identifies domains linking to all your competitors but not your site. Semrush also lets you select competitors from its Organic Competitors data. Semrush

3. Moz Pro — good simpler alternative

Moz's Link Intersect does essentially the same thing: identify sites linking to competitors but not you. You can compare up to five competitors and sort opportunities by Domain Authority, Spam Score, and intersection count. Cloudfront

My practical recommendation

If you're doing this for SEO link-building at scale, I'd choose:

Ahrefs → best overall for backlink gap research
Semrush → best if you already live in the Semrush ecosystem
Moz → good if you want a simpler interface

One important distinction: don't just compare your domain against your known competitors. First identify your actual organic SERP competitors for the keywords/pages you're targeting, then run the backlink gap. Ahrefs, for example, can identify organic competitors and feed them into Link Intersect. Ahrefs Help Center

If you give me your domain + 3–10 competitor domains, I can also show you exactly how I'd structure the gap analysis (including which filters I'd use to separate high-priority link prospects from junk/irrelevant domains).

If you're a beginner and specifically want to spot backlink quality and understand anchor-text distribution, I'd start with these:

1. Semrush — easiest starting point

I'd probably recommend this if you're completely new.

Its backlink reports put Authority Score, referring domains, anchor text, follow/nofollow status, and source-page information in one place. Its Backlink Audit also provides a Toxicity Score and lets you investigate links using numerous quality-related parameters. Semrush Semrush

semrush.com

For anchor text, you can quickly see the most common anchors and how many domains/backlinks use each one. Semrush

Why I'd choose it as a beginner: the interface tends to translate raw backlink data into recognizable signals rather than making you interpret everything yourself.

2. Ahrefs — best for learning deeper analysis

Ahrefs is particularly good once you want to understand why a backlink is valuable rather than just seeing a quality score.

Its Referring Domains report lets you examine things such as the number of links from a domain, dofollow links, traffic, and the contexts/anchors of individual links. Ahrefs

Its Anchors report specifically breaks down the anchor text used across backlinks and can help identify potentially over-optimized or unnatural patterns. Ahrefs

ahrefs.com

3. Moz Link Explorer

Moz is worth considering if you want something relatively straightforward while learning concepts such as domain authority and link profiles.

What to actually look for

Don't make the beginner mistake of treating "high authority = good backlink." A useful manual check is:

• Relevance: Does the linking website/page genuinely relate to your topic?
• Real website: Does it appear to have real content, users, and organic visibility?
• Referring-domain diversity: 100 links from one domain aren't equivalent to links from 100 independent domains. Ahrefs explicitly distinguishes backlinks from referring domains. Ahrefs Help Center
• Link placement/context: A contextual editorial link can tell you much more than a random sitewide link.
• Anchor distribution: Look for a mixture of branded, URL, topical/natural, and other anchors rather than an unusually concentrated set of keyword-heavy anchors. Ahrefs notes that natural profiles commonly have substantial branded-anchor usage. Ahrefs
• Follow/nofollow/sponsored/UGC: Don't automatically classify nofollow links as worthless; treat the attributes as part of the overall picture.

My beginner workflow

Start with Semrush → inspect referring domains → sort/filter by authority and relevance → open the actual linking pages → then examine the Anchors report.

Once you're comfortable with that, use Ahrefs to dig deeper into individual pages and competitors.

If you tell me your website type and approximate budget ($0 / <$50/mo / $100+ per month), I can narrow this down to the most practical tool for you.

Why I'd choose it as a beginner: the interface tends to translate raw backlink data into recognizable signals rather than making you interpret everything yourself.

2. Ahrefs — best for learning deeper analysis

Ahrefs is particularly good once you want to understand why a backlink is valuable rather than just seeing a quality score.

Its Referring Domains report lets you examine things such as the number of links from a domain, dofollow links, traffic, and the contexts/anchors of individual links. ahrefs.com

Its Anchors report specifically breaks down the anchor text used across backlinks and can help identify potentially over-optimized or unnatural patterns.

For a beginner who wants to spot link quality issues and understand anchor text distribution, I’d prioritize tools with clear dashboards, simple explanations, and useful filtering rather than the biggest raw backlink databases. No tool sees every backlink on the web, and each uses its own link index and proprietary scores, so treat metrics like DR, DA, Authority Score, or Trust Flow as indicators—not Google ranking factors. LinkVetted

Beginner-friendly backlink analysis tools

Link Index Semrush## My beginner picks

1. Best starting point: Moz Link Explorer

Good if you’re new and want to answer:

• “Are my backlinks mostly from legitimate sites?”
• “Do I have suspicious/spammy links?”
• “Is my anchor text too repetitive?”

Moz’s interface is relatively straightforward, and its Spam Score is designed as a quick risk indicator. Keep in mind that Moz’s Domain Authority is a Moz-created metric, not a Google metric. LinkVetted

2. Best all-around learning tool: Semrush Backlink Analytics

Useful when you want a guided audit:

• See referring domains
• Review follow/nofollow links
• Sort links by authority
• Review anchor text patterns
• Identify potentially risky links

Semrush also provides a free backlink checker with limited data so you can try the workflow before paying. Semrush

3. Best if you want to grow into advanced SEO: Ahrefs

Ahrefs is excellent for:

• Competitor backlink research
• Finding sites that link to competitors but not you
• Studying which pages attract links
• Digging into anchor text variations

It has more depth, but beginners may initially find the amount of data overwhelming. Link Index

What to check in a backlink report

For link quality:

• Referring domain quality: Is the linking site relevant to your topic?
• Organic traffic: Does the site appear to have real visitors?
• Context: Is the link surrounded by useful content or dropped into a random page?
• Link pattern: Are many links coming from the same few domains?
• Follow/nofollow/sponsored attributes: Understand what type of links you’re seeing.

For anchor text distribution:

• A natural profile usually contains a mix of:

• Brand anchors (“Company Name”)
• Naked URLs (“example.com”)
• Generic anchors (“click here,” “learn more”)
• Topic-related phrases
• Some exact-match keyword anchors

Potential warning signs:

• A large percentage of backlinks using the exact same money keyword
• Many unrelated sites using identical anchor text
• Sudden spikes in keyword-rich anchors

A simple beginner workflow

1. Put your site into Semrush or Ahrefs.
2. Export your backlinks.
3. Sort by:

• highest authority domains
• lowest-quality-looking domains
• anchor text frequency
• Review the top 50–100 links manually.
• Compare your anchor distribution against a few similar sites.

If you’re only going to use one tool while learning, I’d start with Semrush for guided audits or Moz for simplicity; move to Ahrefs once you’re comfortable interpreting backlink data. LinkVetted Semrush

If your main goal is feeding backlink data into an internal dashboard via API, I’d shortlist Ahrefs, Majestic, and Semrush. They differ substantially in API economics and the type of link data they expose.

1. developer-support.majestic.com — particularly strong for link-specific dashboards

Majestic is worth looking at first if your dashboard is fundamentally a backlink intelligence product rather than a general SEO dashboard.

Its API exposes unusually granular link information, including discovery dates, crawl history, anchor text, redirects, link validity, link types, image/ALT information and nofollow attributes. It also maintains both a frequently updated Fresh Index and a much larger Historic Index. Majestic Developer Majestic

That makes it attractive for dashboards showing things like:

• New/lost backlinks
• Link freshness
• Referring-domain growth
• Historical link profiles
• Link-type distributions
• Anchor-text analysis
• Link-status monitoring

2. docs.ahrefs.com — strong general-purpose option

Ahrefs' API v3 exposes Site Explorer data including backlinks and historical charts, alongside organic/paid traffic and other SEO datasets. It also supports batch analysis for multiple targets. Ahrefs Docs

The important consideration is its API-unit model: request costs depend on rows and fields, with a minimum cost for paid requests. Ahrefs specifically recommends selecting only the fields you need and using bulk endpoints where possible to control consumption. Ahrefs Docs

Current plans include API access, with enterprise offering uncapped API access and custom endpoints. Ahrefs

I'd favor Ahrefs when the dashboard will eventually combine backlinks + organic traffic + keywords + SERPs + site-audit information.

3. developer.semrush.com — good if you're already in the Semrush ecosystem

Semrush's new Backlinks API v4 is particularly dashboard-friendly. It has explicit endpoints for:

• Individual backlinks
• Referring domains
• Referring IPs
• Indexed pages
• Anchors
• Competitors
• Bulk comparison
• Backlink-gap/matrix analysis

For example, the links endpoint supports URL/domain/page-level scope, selectable fields, sorting and limits. Semrush Developer

One caveat: v4 is currently Early Access, so Semrush says endpoints, response formats and pricing can change before general availability. The older v3 backlink endpoints are deprecated for new integrations. Semrush Developer Semrush Developer

What I'd choose by architecture

• Backlink-centric internal data warehouse: Majestic
• Full SEO intelligence dashboard: Ahrefs
• Existing Semrush infrastructure / broader marketing data: Semrush
• Small, relatively simple integration: I'd evaluate Ahrefs and Semrush primarily on your expected API-unit consumption before committing.

For an internal dashboard, I would not optimize around the provider's UI. I'd compare the APIs on rows returned per dollar, freshness, historical retention, pagination/limits, fields available at link level, rate limits, and whether you can legally retain/cache the data. Those factors can matter much more than the headline size of the backlink index.

If you tell me roughly how many domains you need to monitor and how many backlinks/API rows you expect per day, I can calculate the likely API economics for Ahrefs vs. Semrush vs. Majestic and suggest an architecture.

For an internal dashboard that needs backlink data, the “best” API depends on whether you prioritize index size, freshness, cost efficiency, ease of integration, or enterprise scalability. The main contenders are:

My shortlist for dashboard integrations

1. Ahrefs API — best for deep backlink intelligence

docs.ahrefs.com

Good for:

• Referring domains
• Backlink discovery
• Lost/new link monitoring
• Competitor link analysis
• Historical link reporting

Ahrefs API v3 exposes Site Explorer backlink data and supports integrations through API access, with usage based on API units and returned data volume. Ahrefs for Developers Ahrefs for Developers

Pros

• Excellent link dataset reputation
• Strong SEO practitioner adoption
• Useful metrics like Domain Rating and referring domains
• Good documentation

Cons

• Can become expensive for high-volume dashboards
• API access depends on plan

Choose it if: your dashboard is primarily a backlink intelligence product.

2. Semrush API — best all-around marketing dashboard API

developer.semrush.com

Good for:

• Backlinks
• Referring domains
• Anchor text
• Competitor comparisons
• Combining backlink data with keyword/ranking data

Semrush’s current Backlinks API provides endpoints for backlink lists, overview metrics, pages, referring domains, and related SEO reports. It supports JSON and CSV responses and lets you select returned fields. Semrush Developer Semrush Developer

Pros

• Strong ecosystem beyond links
• Good for executive dashboards
• Flexible fields and filtering
• Easier if you already use Semrush datasets

Cons

• API units can require careful budgeting
• Some newer API functionality is still evolving

Choose it if: your dashboard mixes backlinks with broader SEO KPIs.

3. Majestic API — best for link graph analysis

developer-support.majestic.com

Good for:

• Trust Flow/Citation Flow analysis
• Link neighborhood analysis
• Historical backlink research

Majestic maintains separate Fresh and Historic backlink indexes, making it useful for both recent link discovery and longer-term link analysis. Majestic Developer

Pros

• Link-specialist dataset
• Strong for authority modeling
• Useful metrics for link quality scoring

Cons

• Less broad than Ahrefs/Semrush for general SEO dashboards

Choose it if: your product is about link relationships rather than general SEO reporting.

4. DataForSEO — best developer-first option

DataForSEO

Good for:

• Building your own SEO SaaS
• High-volume automated pipelines
• Custom data models

Pros

• API-first mindset
• More control over workflows
• Often attractive for engineering teams

Cons

• Requires more development work
• Less “ready-made dashboard” oriented

Choose it if: you are building a product, not just an internal report.

What I would pick by architecture

Internal BI dashboard (Looker, Tableau, Power BI)

1. Semrush
2. Ahrefs
3. Majestic

Reason: easier access to standardized SEO metrics and reporting workflows. Semrush specifically documents use cases around loading API data into BI tools and custom dashboards. Semrush Developer

Custom internal application

1. Ahrefs
2. DataForSEO
3. Semrush

Reason: you’ll likely care more about raw link records, pagination, filtering, and predictable API behavior.

Link monitoring product

1. Ahrefs
2. Majestic
3. Semrush

Reason: freshness, historical data, and link discovery matter more than broad SEO coverage.

Data fields worth designing your dashboard schema around

Regardless of provider, I would normalize around:

• source_url
• target_url
• referring_domain
• anchor_text
• first_seen
• last_seen
• link_status (active/lost)
• nofollow/sponsored/ugc
• domain_authority_metric
• traffic_estimate
• country/language
• link_type
• crawl_date

This lets you swap providers later without rebuilding the dashboard.

If you are building a multi-client SEO dashboard, I would lean toward Semrush or Ahrefs. If you are building a data product/API layer, I would evaluate Ahrefs + DataForSEO together.

Yes. For republishing old content, I’d focus on tools that can distinguish between:

1. Broken inbound links — external sites still link to an old URL on your site that now returns 404.
2. Lost backlinks — the destination still exists, but the external site removed the link.
3. Redirect opportunities — an old URL has valuable backlinks and should potentially redirect to the republished version.

Best tools

• Ahrefs — probably the most useful for this workflow. Its Broken backlinks report shows referring pages linking to your 404 URLs, including anchor text and surrounding text. You can also use Best by Links → HTTP 404 to find deleted pages with backlinks. Ahrefs Help Center Ahrefs

ahrefs.com

• Semrush — its Backlink Audit → Lost & Found report tracks new, broken, and lost backlinks, with filters for prioritizing valuable links. Semrush Semrush

semrush.com

• Majestic — particularly useful for historical/lost-link analysis. Its Lost Backlinks report lets you examine when links disappeared and metrics such as Trust Flow, Citation Flow, and topical relevance. Majestic Majestic

majestic.com

For your specific republishing workflow

I'd do this in Ahrefs:

1. Find your old 404 URLs with backlinks

Site Explorer → your domain → Pages → Best by Links → filter HTTP code: 404

2. Sort/prioritize by referring-domain quality and number of backlinks.

3. Map each old URL to the republished article.

For example:

/old-seo-guide/
        ↓
/seo-guide-2026/

If the new article substantially replaces the old one, a 301 redirect from the old URL to the new URL is usually the cleanest reclamation mechanism. Ahrefs specifically recommends restoring valuable deleted pages or redirecting them to relevant pages. Ahrefs

4. Separately check Ahrefs → Backlinks → Lost.

This catches cases where the old article is still live but someone removed your link. Those are outreach opportunities rather than redirect opportunities. Ahrefs lets you filter lost links by the reason they disappeared. Ahrefs Ahrefs Help Center

One important distinction

Don't redirect every old URL with backlinks to the new article. If the old URL covered a substantially different topic, a blanket redirect can be a poor relevance match. I'd classify the URLs as:

• Same content, new URL → 301
• Old content can be substantially restored → republish at the old URL if practical
• Similar topic, but materially different content → consider a highly relevant replacement/redirect only if appropriate
• No meaningful replacement → leave 404/410 rather than forcing an irrelevant redirect

If you're doing this at scale, Ahrefs + a spreadsheet of old URLs → backlink counts → referring domains → new URL mapping is a very effective setup.

3. Map each old URL to the republished article.

For example:

/old-seo-guide/
        ↓
/seo-guide-2026/

If the new article substantially replaces the old one, a 301 redirect from the old URL to the new URL is usually the cleanest reclamation mechanism. Ahrefs specifically recommends restoring valuable deleted pages or redirecting them to relevant pages. Ahrefs

4. Separately check Ahrefs → Backlinks → Lost.

This catches cases where the old article is still live but someone removed your link. Those are outreach opportunities rather than redirect opportunities. Ahrefs lets you filter lost links by the reason they disappeared. Ahrefs Ahrefs Help Center

One important distinction

Don't redirect every old URL with backlinks to the new article. If the old URL covered a substantially different topic, a blanket redirect can be a poor relevance match. I'd classify the URLs as:

• Same content, new URL → 301
• Old content can be substantially restored → republish at the old URL if practical
• Similar topic, but materially different content → consider a highly relevant replacement/redirect only if appropriate
• No meaningful replacement → leave 404/410 rather than forcing an irrelevant redirect

If you're doing this at scale, Ahrefs + a spreadsheet of old URLs → backlink counts → referring domains → new URL mapping is a very effective setup.

If your goal is republishing/updating old content and reclaiming backlinks that currently point to dead URLs, I’d focus on these:

1. Ahrefs — strongest fit for this workflow
   • Site Explorer → Backlinks → Broken backlinks shows referring pages linking to your 404 URLs, including anchor/context. help.ahrefs.comwww.semrush.comahrefs.com
   • Pages → Best by Links → HTTP code: 404 lets you find your dead pages with the most referring domains, which is particularly useful when deciding which old articles are worth restoring. ahrefs.com
   • Backlinks → Lost is useful for a second pass: links that disappeared even though the destination isn't necessarily a 404. ahrefs.comahrefs.com

2. Semrush — good alternative
   • Backlink Audit → Target URL Error identifies backlinks pointing to broken pages, making it easy to find URLs that could be restored or redirected. www.semrush.com
   • It also monitors new, broken, and lost backlinks, so it's useful for ongoing reclamation rather than a one-time audit. www.semrush.com

3. Google Search Console — useful free cross-check
   • Its Links report gives you Google's discovered external links and the pages receiving them. However, Google explicitly says it's a sample rather than a comprehensive backlink list, and it doesn't tell you directly which links are currently broken. support.google.com
   • I'd use it alongside Ahrefs/Semrush rather than as the primary reclamation tool.

For your specific republishing workflow

I'd do:

Old URL inventory → find 404s with backlinks → prioritize by referring domains/quality → republish the relevant article → 301 old URL to the new URL → verify the backlinks resolve.

For example, if /2020/old-guide/ has 35 referring domains but now returns 404, that's a strong candidate for republishing. If the new article substantially covers the same intent, redirect the old URL to it rather than creating a competing new URL.

One important distinction: “broken backlinks” and “lost backlinks” aren't the same thing. A broken backlink usually means the external site still links to you, but your target URL is dead; a lost backlink can mean the external site removed the link, redirected the page, changed canonicalization, etc. Ahrefs provides separate reporting for these. help.ahrefs.com

My practical pick: if you're doing a serious content-republishing project, Ahrefs is probably the single tool I'd use first, because its broken-backlink + 404-page + lost-backlink reports map very closely to the reclamation workflow. ahrefs.comahrefs.com

If your goal is to track backlinks and the likely traffic value of each referring domain, there are two different metrics worth separating:

• Estimated organic traffic to the referring domain — useful as a proxy for how much audience the site has.
• Estimated referral visits actually sent to your site — much closer to what you’re asking for, but generally available from traffic-intelligence tools rather than traditional backlink crawlers.

Best options

Ahrefs is particularly convenient if you want one SEO-oriented workflow. Its Referring Domains report includes estimated organic traffic for the linking domain, alongside metrics such as Domain Rating and links to your target. Ahrefs Ahrefs

ahrefs.com

The important caveat is that Ahrefs' traffic figure is estimated organic search traffic to the referring site, not the amount of traffic that particular site actually sends you. Ahrefs

Similarweb is stronger if your primary question is "Which referring domains actually send traffic?" Its Incoming Traffic/Referrals data provides referring websites, referral traffic volume/share, trends and engagement metrics; its API can return estimated visits by referring domain. Similarweb Similarweb Similarweb API V5 Documentation

similarweb.com

What I'd use

For a serious link-building/referral monitoring dashboard, I'd combine them:

Ahrefs → backlink discovery + link quality + estimated organic traffic of the referring domain

Similarweb → estimated referral visits + traffic share + trend from each referring domain

Then, for your own site, use your first-party analytics to validate the estimates. This distinction matters because a domain can have huge organic traffic and still send almost no referral traffic through your particular backlink.

If you want one tool only, Ahrefs is the more natural choice for backlink-first monitoring; if referral traffic itself is the KPI, Similarweb's data is more directly aligned with it. Ahrefs Similarweb

If your goal is specifically “backlinks + estimated traffic from each referring domain”, I’d shortlist these:

The important distinction

Ahrefs is very good if you want to identify valuable linking domains and see their estimated organic search traffic. Its Referring Domains report can be sorted by traffic, and Ahrefs explicitly exposes estimated organic traffic for linking pages and referring domains. Ahrefs Ahrefs

Semrush is more interesting if you want the backlink dataset alongside a broader total-traffic estimate. Its Backlink Analytics overview includes referring domains/backlinks plus monthly visits, while Traffic Analytics estimates traffic using clickstream data and breaks it down into referral, organic, paid, social, etc. Semrush Semrush

Similarweb is the closest match to your wording. Its Incoming Traffic reports specifically show referring websites and estimated referral visits, along with traffic share, trends, and engagement. It also has a Referring Domains report that can be analyzed alongside the traffic data. Similarweb Knowledge Center Similarweb Knowledge Center

What I'd use

• SEO/link-building workflow: Ahrefs — particularly good for filtering referring domains by organic traffic and evaluating the actual links. Ahrefs
• Backlinks + broader competitive traffic intelligence: Semrush — useful when you want estimated total visits rather than just search traffic. Semrush Semrush
• Backlinks + actual estimated referral potential: Similarweb — its referral reports are specifically designed around traffic coming from external sites. Similarweb Knowledge Center Similarweb Knowledge Center

One caveat: none of these estimates should be treated as the actual referral traffic your site receives. They're third-party estimates. For your own site, GA4/analytics data is the source of truth; these tools are most useful for estimating the traffic potential of prospective or competitor referring domains. Ahrefs, for example, explicitly describes its traffic figures as estimates. Ahrefs Help Center

If you're building a referring-domain monitoring sheet, I'd actually combine Ahrefs + Similarweb: Ahrefs for link discovery/quality and Similarweb for estimated referral traffic.

Similarweb is the closest match to your wording. Its Incoming Traffic reports specifically show referring websites and estimated referral visits, along with traffic share, trends, and engagement. It also has a Referring Domains report that can be analyzed alongside the traffic data.

What I'd use

If your priority is “run backlink analysis → turn it into something I can send a client without much cleanup,” I’d shortlist these:

1. Semrush — easiest all-around agency reporting

Semrush is probably the most straightforward if client reporting is a major part of your workflow.

Its Backlinks and Backlink Audit reports can be exported directly to PDF, while My Reports lets you combine backlink data with other Semrush metrics, Google Analytics, and Search Console. You can customize the report to your branding and schedule automatic delivery. Semrush Semrush

The particularly useful distinction is:

• PDF → client-facing summary
• CSV/Excel → detailed backlink spreadsheet for your working files
• My Reports → branded, recurring client report

Semrush also lets you email and schedule reports; white-label/branding is available through its My Reports setup. Semrush Semrush

semrush.com

2. Ahrefs — excellent if backlink analysis itself is the priority

Ahrefs has particularly strong backlink research, and its newer Report Builder makes the client-facing side much easier than it used to be.

You can build reports from Site Explorer data, including backlink metrics, add text/commentary, and export them as PDFs. Reports can also be scheduled for automatic PDF delivery, with recipients not needing an Ahrefs account. Ahrefs Help Center Ahrefs

One caveat: Ahrefs' raw backlink data is primarily a CSV export, whereas the polished PDF experience comes through Report Builder. Ahrefs Help Center

ahrefs.com

3. SE Ranking — worth considering for an agency with lots of clients

SE Ranking is worth putting on your shortlist if you're managing many smaller client accounts and want reporting built into an agency-oriented workflow. I'd put it ahead of Majestic if ease of client communication matters more than having the deepest backlink dataset.

My practical choice

For an SEO consultant, I'd frame it this way:

• Want the easiest complete client-reporting workflow: Semrush
• Want the strongest backlink research + increasingly good reporting: Ahrefs
• Want an agency-oriented alternative that can be cost-efficient across many clients: SE Ranking
• Want backlink data primarily for analysis rather than polished client presentations: Majestic

If PDFs are the deciding factor, Semrush has the clearest advantage in workflow: you can go from backlink report → branded/custom PDF → scheduled client delivery without having to assemble the report elsewhere. Ahrefs is very close, particularly if you want to build a more customized report around backlink metrics. Semrush Ahrefs

If you tell me how many clients you manage and whether you need white-label logos/domains, I can also compare the current agency pricing and reporting limits of Semrush vs Ahrefs vs SE Ranking.

One caveat: Ahrefs' raw backlink data is primarily a CSV export, whereas the polished PDF experience comes through Report Builder. help.ahrefs.com

ahrefs.com

3. SE Ranking — worth considering for an agency with lots of clients

SE Ranking is worth putting on your shortlist if you're managing many smaller client accounts and want reporting built into an agency-oriented workflow. I'd put it ahead of Majestic if ease of client communication matters more than having the deepest backlink dataset.

My practical choice

For an SEO consultant, I'd frame it this way:

If your priority is “run backlink analysis → turn it into something a client can understand → export/send a polished PDF”, I’d narrow it to Semrush and Ahrefs, with Semrush having the smoother agency-reporting workflow.

1. Semrush — easiest for agency/client reporting

semrush.com

This would be my first choice if reporting is the main criterion.

Semrush's Backlink Analytics and Backlink Audit reports can be exported directly to PDF, while My Reports lets you combine backlink data with other SEO/marketing data, apply your branding, and schedule reports. Semrush Semrush

The particularly useful part for consultants is that My Reports supports white-labeling, logos/colors, custom layouts, multiple data sources, and scheduled delivery. Semrush Semrush

Best for: monthly client reporting, agencies, branded deliverables, clients who don't want to look at SEO software.

2. Ahrefs — excellent data + increasingly good reporting

ahrefs.com

Ahrefs is particularly attractive if backlink analysis itself is central to your consulting work. Its Report Builder can combine backlink, ranking, traffic and other metrics into custom reports and schedule them as PDFs. Ahrefs Ahrefs

The big catch for client work: Ahrefs currently does not allow its PDF reports to be white-labeled. Ahrefs Help Center

So I'd choose Ahrefs when the client values the underlying backlink intelligence more than having a completely agency-branded report.

3. SE Ranking — worth considering for a lean consultancy

SE Ranking is worth a look if you want something more explicitly geared toward agency-style reporting and white-label delivery, rather than buying a heavyweight SEO suite primarily for its backlink database.

My practical recommendation

If you're an independent SEO consultant, I'd structure the choice like this:

• Need the easiest polished, branded client PDF: Semrush
• Backlink intelligence is the core of your service: Ahrefs
• Want agency reporting without going as heavyweight: SE Ranking
• Primarily need a backlink database rather than presentation: Majestic
• Already invested in the Moz ecosystem: Moz Pro

One important distinction: “backlink data export” and “client report export” aren't the same thing. Ahrefs, for example, is very good at exporting underlying backlink tables as CSV, but its Report Builder is what turns the data into a presentation-oriented PDF. Ahrefs Help Center Ahrefs Semrush makes that same distinction but puts more emphasis on the branded-report workflow. Semrush

If I were optimizing specifically for a consultant's workflow, I'd pick Semrush for reporting and Ahrefs for backlink research. If you only want to pay for one, the deciding factor is whether client presentation or backlink research depth is more important.

Semrush's Backlink Analytics and Backlink Audit reports can be exported directly to PDF, while My Reports lets you combine backlink data with other SEO/marketing data, apply your branding, and schedule reports. Semrush Semrush

The particularly useful part for consultants is that My Reports supports white-labeling, logos/colors, custom layouts, multiple data sources, and scheduled delivery. Semrush Semrush

Best for: monthly client reporting, agencies, branded deliverables, clients who don't want to look at SEO software.

2. Ahrefs — excellent data + increasingly good reporting

ahrefs.com

Ahrefs is particularly attractive if backlink analysis itself is central to your consulting work. Its Report Builder can combine backlink, ranking, traffic and other metrics into custom reports and schedule them as PDFs. ahrefs.com ahrefs.com

The big catch for client work: Ahrefs currently does not allow its PDF reports to be white-labeled.

So I'd choose Ahrefs when the client values the underlying backlink intelligence more than having a completely agency-branded report.

3. SE Ranking — worth considering for a lean consultancy

SE Ranking is worth a look if you want something more explicitly geared toward agency-style reporting and white-label delivery, rather than buying a heavyweight SEO suite primarily for its backlink database.

For negative-SEO monitoring, I’d use multiple link indexes rather than trusting any single “toxicity” score. Google itself says third-party tools don’t have access to its internal ranking data, and specifically recommends using Search Console as the first-party source. Google for Developers Google Help

Practical stack

• Google Search Console — essential baseline. Its Links report can show recent links, linking domains, target pages, and anchor text. It is not comprehensive, so treat it as Google's observed sample rather than your complete backlink database. Google Help Google Help
• Ahrefs — particularly useful for monitoring new/lost backlinks, referring-domain growth, anchor-text changes, and historical trends. Its own documentation cautions against treating its “toxic” classification as proof that a link will hurt rankings. Ahrefs Help Center
• Semrush Backlink Audit — useful for large-scale classification and recurring monitoring, especially when you need to triage thousands of referring domains.
• Majestic — useful as a second independent link index, particularly when you want another crawler's view of referring domains and link-history patterns.

What I would actually alert on

Rather than “toxicity score > X,” build alerts around changes in the backlink graph:

• Sudden increase in new referring domains over the site's normal baseline.
• Large clusters of links appearing within hours/days.
• Repeated, unusually optimized anchor text.
• Hundreds of domains linking to the same URL, particularly a commercial page that historically received few links.
• Links coming from many apparently unrelated sites but sharing similar templates, hosting infrastructure, language, or page structures.
• Large numbers of newly discovered links from pages that look automatically generated, hacked, scraped, or irrelevant.
• Sudden changes in the distribution of followed/nofollow/UGC links.
• A spike concentrated in one country/language/TLD that doesn't match the site's normal audience.

Google specifically recommends examining links created recently when investigating unnatural-link issues, and its documentation identifies automated link creation and links intended to manipulate rankings as link spam. Google Help Google for Developers

For “malicious” patterns, separate SEO from security

If by malicious you mean hacked pages, redirects, phishing, injected content, or malware, backlink tools aren't sufficient. Pair them with:

• Google Search Console Security Issues + Manual Actions
• Server/CDN/WAF logs
• URL crawling and change monitoring
• Google Safe Browsing checks

Google recommends checking Security Issues when diagnosing suspicious search problems and provides separate reporting mechanisms for spam, malware, and phishing. Google for Developers Google for Developers

My preferred workflow: Search Console for Google's own view → Ahrefs + Semrush/Majestic for independent link discovery → your own time-series/cluster analysis for anomaly detection → Search Console/security tooling to determine whether there's an actual Google or site-security consequence.

One important caveat: a sudden flood of spammy backlinks isn't by itself evidence of a successful negative-SEO attack. Google says known spammy links are typically ignored, so investigate the pattern and its correlation with actual search/security changes rather than automatically disavowing everything that looks ugly. Google Help Ahrefs Help Center

For negative-SEO monitoring, I’d use multiple link indexes rather than trusting a single “toxicity” score. The strongest setup is:

• Ahrefs — probably the most useful day-to-day detector for sudden link spikes. Its New/Lost Backlinks alerts can notify you when a domain gains links, and Site Explorer lets you isolate new referring domains, anchors, pages, and referring IPs. Ahrefs specifically recommends watching abnormal increases in referring domains and investigating the resulting patterns. Ahrefs Ahrefs
• Semrush Backlink Audit — particularly useful for triage at scale. It evaluates links using 45+ toxic markers, supports new/lost-link monitoring, and can group/analyze suspicious links and produce a disavow file. Treat its Toxicity Score as a prioritization signal, not proof that a link is harmful. Semrush Semrush
• Majestic — valuable as a second independent backlink index. Its Fresh Index is designed for current link discovery, while the Historic Index gives you a long-term baseline. Link Context is especially useful for examining where a link occurs on a page and its surrounding linking environment. Majestic Majestic
• Google Search Console — keep this as the first-party reference point for Google's view of your site's links. It's less useful for real-time attack detection than the commercial crawlers, but important for corroborating changes and checking for Search-related issues.

What I’d actually monitor

For each site, establish a 30–90 day baseline for:

• New referring domains/day
• New backlinks/day
• Followed vs. nofollowed links
• Anchor-text distribution
• Target-page distribution
• Country/TLD distribution
• Referring-domain traffic/quality
• Links clustered on the same IP/subnet
• Sudden waves of very similar domains/pages

The IP/subnet clustering is particularly interesting for malicious patterns: Ahrefs' Referring IPs report can group referring domains by IP/subnet and examine new links over a selected period. A large group of newly appearing domains on the same infrastructure can be a useful investigation signal. Ahrefs Help Center

A practical detection rule

Don't flag something simply because it has a high “toxicity” score. Instead, look for multiple signals occurring simultaneously, e.g.:

500 new referring domains in 48 hours + highly repetitive anchors + near-identical linking pages + same hosting subnet + negligible organic traffic.

That pattern is substantially more interesting than, say, 500 legitimate links caused by a news story.

Also, remember that a spike isn't automatically an attack. Viral content, PR, syndication, scraper discovery, or a legitimate campaign can create very abrupt backlink growth. Ahrefs makes the same distinction in its negative-SEO guidance. Ahrefs

My preferred stack: Ahrefs for detection/alerts + Majestic for independent corroboration + Semrush for bulk triage + Search Console for Google's own data. That combination gives you much better protection against both false positives and blind spots than relying on a single “toxic link” metric.

For international link prospecting, I’d focus less on raw index size and more on whether the tool lets you isolate country, TLD, language, and local referring domains.

My practical shortlist

Why I'd put Semrush first for this particular use case

Semrush has an explicit Top Countries backlink report. It determines a backlink's country from the IP address of the referring domain and lets you drill into the domains linking from a selected country. Semrush Semrush Developer

That's particularly useful for something like:

"Show me sites in Germany that link to competitors but not us."

You can also filter by TLD, so you can separately investigate .de, .fr, .es, .it, etc. Semrush currently reports a backlink database of 43T+ backlinks and 800M+ domains, with roughly 10B pages crawled daily. Semrush

Its broader SEO database also has 142 regional keyword databases, which is useful when you're combining backlink research with localized search-market research. Semrush

Majestic is especially interesting for huge/long-tail international discovery

Majestic has an enormous backlink corpus and two indexes:

• Fresh Index — recently crawled links.
• Historic Index — backlink relationships discovered going back to 2006. Majestic Developer Majestic

It also supports filtering backlink research by language, topic and quality. Majestic

So if your problem is:

"I want to find obscure publishers, directories, blogs and local sites that aren't necessarily prominent in English-speaking SEO datasets."

I'd definitely test Majestic alongside Semrush.

Ahrefs is excellent for the quality side of international outreach

Ahrefs gives you referring-domain and backlink-level analysis, including DR, estimated organic traffic, links to target, etc. Ahrefs Ahrefs

Its keyword database also explicitly supports a very large number of country/language locales—for example, localized databases for Arabic, German, Spanish, French, Japanese, Korean, etc. Ahrefs Help Center

That makes it particularly useful when your workflow is:

Find local competitors → identify their referring domains → filter for legitimate publishers → evaluate traffic/authority → build outreach list.

One important caveat

"Country" ≠ "language."

Semrush's backlink-country classification is based on the referring domain's IP address, not necessarily the language of the linking page. Semrush

For international outreach, I'd therefore combine:

1. Country/TLD — .de, .fr, .jp, etc.
2. Language of the actual page/site
3. Local organic traffic
4. Local audience/relevance
5. Referring-domain uniqueness
6. Competitor overlap

That prevents you from building a German outreach list that's technically "Germany-based" but actually consists of English-language sites, international CDN/hosting artifacts, or irrelevant directories.

If you're buying one specifically for international outreach

I'd choose based on workflow:

• Semrush → best if your core question is "Which sites in each target country link to competitors?"
• Majestic → best if you want maximum backlink discovery, especially historical/long-tail links.
• Ahrefs → best if you care heavily about evaluating the quality and organic value of each prospect.

For a serious multinational outreach operation, I'd actually use Semrush + Ahrefs or Semrush + Majestic rather than expecting one index to be comprehensive. The overlap and gaps between backlink crawlers are significant.

If you tell me which countries/languages you're targeting (e.g. Germany + France + Japan + Korea), I can also compare these tools specifically for those markets and identify which one is likely to give you the deepest prospect pool.

That makes it particularly useful when your workflow is:

Find local competitors → identify their referring domains → filter for legitimate publishers → evaluate traffic/authority → build outreach list.

One important caveat

"Country" ≠ "language."

Semrush's backlink-country classification is based on the referring domain's IP address, not necessarily the language of the linking page.

For international outreach/link prospecting, I’d look at the major backlink indexes a little differently than I would for general SEO reporting. The key question is: how well does the crawler actually discover links from the countries/languages I care about?

My practical shortlist

1. Ahrefs — strongest general-purpose choice

ahrefs.com is probably where I'd start if your goal is finding actual outreach prospects across many countries.

Ahrefs says its crawler operates globally regardless of language, and specifically notes that backlink coverage tends to be similarly strong in non-English markets. Its current backlink index is also extremely large: it reports 35 trillion historical backlink records and 493.9 billion pages in its index, with live-backlink data refreshed every 15–30 minutes. Ahrefs Ahrefs

The important caveat: Ahrefs' keyword coverage varies substantially by country, especially in smaller markets. That's different from backlink coverage, which Ahrefs says is generally strong internationally. Ahrefs

I'd choose Ahrefs when: you're prospecting across, say, Germany + France + Japan + Brazil + Korea and want one large database rather than a specialist tool for each market.

2. Majestic — particularly interesting for multilingual outreach

majestic.com has a feature that makes it unusually useful for your specific question: it explicitly detects the language of source pages and incoming anchor text.

For example, its reports can break incoming links down by languages such as German, French, Chinese, Japanese, etc. Majestic Blog Majestic

Its API also exposes the language of the source page, including multiple detected languages for multilingual domains. Majestic Developer

And the underlying index is enormous: Majestic currently reports roughly 533 billion unique URLs found in Fresh and 21.7 trillion unique URLs found in Historic. Majestic

That's why I'd seriously consider Majestic if your workflow is:

"Show me websites linking to competitors where the source page is French/German/Japanese/Spanish/etc."

rather than merely:

"Show me links originating from France."

For pure multilingual link research, Majestic may actually be more useful than Semrush.

3. Semrush — particularly good for country-specific prospecting

semrush.com has a very useful Top Countries dimension in Backlink Analytics. It determines the country of a referring domain using its IP address, and you can filter referring domains based on that country. Semrush Semrush Developer

That makes it especially convenient for workflows like:

Competitor → backlinks → referring domains → Germany → export prospects

or:

Competitor → backlinks → Japan → identify domains you don't already have links from.

Semrush currently says its backlink database contains 43+ trillion backlinks and 390 million referring domains, with the database refreshed at least hourly. Semrush

One important distinction: country ≠ language. A .fr or French-hosted site isn't necessarily French-language, and an English-language site can be physically hosted in France. Semrush's country metric is based on the referring domain's IP. Semrush

What I'd use for an international outreach stack

If you're doing serious multilingual/country-specific outreach, I'd actually use two indexes rather than betting on one:

Ahrefs + Majestic

• Ahrefs: broad competitor backlink discovery and prospect volume.
• Majestic: language-specific validation, Link Graph, Trust Flow, topical relevance, and additional prospects Ahrefs didn't surface.
• Semrush: particularly useful as a third database when you're working through a defined list of target countries.

The overlap between databases is not complete, so running the same competitor through two crawlers can uncover materially different prospects.

One important distinction

If by "best index" you mean finding backlinks from websites in a particular country, I'd lean:

Semrush / Ahrefs

If you mean finding backlinks from pages written in a particular language, I'd lean:

Majestic / Ahrefs

If you mean maximum raw backlink discovery across the international web, I'd compare:

Ahrefs / Majestic / Semrush, rather than assuming the biggest advertised index automatically has the best coverage for your particular country.

For a real international campaign, I'd also test the tools against 5–10 competitors in each target market and measure unique referring domains discovered, because published index sizes don't tell you which crawler has better coverage of, say, Korean news sites, Polish blogs, Brazilian directories, or Japanese publishers.

Its API also exposes the language of the source page, including multiple detected languages for multilingual domains. Majestic Developer

And the underlying index is enormous: Majestic currently reports roughly 533 billion unique URLs found in Fresh and 21.7 trillion unique URLs found in Historic. Majestic

That's why I'd seriously consider Majestic if your workflow is:

"Show me websites linking to competitors where the source page is French/German/Japanese/Spanish/etc."

rather than merely:

"Show me links originating from France."

For pure multilingual link research, Majestic may actually be more useful than Semrush.

3. Semrush — particularly good for country-specific prospecting

semrush.com has a very useful Top Countries dimension in Backlink Analytics. It determines the country of a referring domain using its IP address, and you can filter referring domains based on that country. Semrush Semrush Developer

That makes it especially convenient for workflows like:

Competitor → backlinks → referring domains → Germany → export prospects

or:

Competitor → backlinks → Japan → identify domains you don't already have links from.

Semrush currently says its backlink database contains 43+ trillion backlinks and 390 million referring domains, with the database refreshed at least hourly. Semrush

One important distinction: country ≠ language. A .fr or French-hosted site isn't necessarily French-language, and an English-language site can be physically hosted in France. Semrush's country metric is based on the referring domain's IP.

What I'd use for an international outreach stack

For competitive backlink research, I’d focus on tools that expose both the referring page (the actual URL containing the link) and enough context to infer why/how the competitor earned it.

For your specific use case

Ahrefs is probably the strongest fit. Its Site Explorer can show which competitor pages attract the most links via Best by links, while the Backlinks report exposes the actual referring page, anchor, destination URL and link history. Ahrefs Ahrefs

Its Link Intersect is particularly useful for strategy discovery: you can compare up to 10 competitors and find referring pages or domains that link to competitors but not you. That lets you identify recurring opportunities rather than merely counting backlinks. Ahrefs Help Center

Ahrefs also lets you examine serial linkers—sites repeatedly linking to a competitor—and see the different pages, contexts and target URLs involved. That's valuable for distinguishing, for example, a genuine editorial relationship from a one-off mention. Ahrefs

Semrush is a strong second choice, especially if you're already using it for keyword and competitor research. Its backlink data includes the source page's title/URL, anchor text, Authority Score, dofollow/nofollow status, and new/lost status. Its Backlink Gap report is useful for finding domains that link to competitors but not your site. Semrush Semrush

What I'd actually analyze

For each competitor, don't just record "they have 20K backlinks." Build a sheet around:

• Top referring pages → Which individual articles/resources generate links?
• Destination pages → Are links concentrated on guides, research, tools, product pages, or homepages?
• Link context → Editorial mention, resource list, guest contribution, directory, partner page, etc.
• Anchor text → Branded vs. descriptive vs. exact-match.
• Referring-domain overlap → Which sites link to multiple competitors?
• Link velocity → Are competitors earning links through a recent campaign or evergreen content?
• Page-level traffic → Are the linking pages themselves getting meaningful search traffic?
• Content pattern → What characteristics do the highly linked pages share?

One especially useful workflow is competitor → Best by links → inspect the highest-linked pages → Backlinks → group referring pages by tactic. Ahrefs explicitly supports using Best by links to identify competitors' most-linked pages and Backlinks to reverse-engineer how those links were acquired. Ahrefs Ahrefs

If you're doing this at scale, I'd use Ahrefs + Semrush together rather than assuming either backlink index is complete; independent crawlers can produce substantially different link inventories. linkvetted.com

ahrefs.com · semrush.com

Semrush is a strong second choice, especially if you're already using it for keyword and competitor research. Its backlink data includes the source page's title/URL, anchor text, Authority Score, dofollow/nofollow status, and new/lost status. Its Backlink Gap report is useful for finding domains that link to competitors but not your site.

What I'd actually analyze

For competitive backlink research, I’d focus on tools that expose the actual referring pages, not just referring-domain counts. The strongest options are:

• Ahrefs — probably the most straightforward for this use case. Its Backlinks report shows the referring page, target page, anchor text, link attributes, and historical links. You can also use Best by links to identify competitors’ most-linked pages and Link Intersect to find pages/domains linking to competitors but not you. Ahrefs Ahrefs Ahrefs Help Center

ahrefs.com

• Semrush — particularly useful if you want to combine backlink research with broader competitor analysis. Its Backlinks tools expose competitors' backlinks, referring domains, recent links, backlink gaps, and important partnerships. Semrush Semrush

semrush.com

• Majestic — especially interesting when you want to understand how the link is positioned on the referring page, rather than merely knowing that a link exists. Its Link Context data identifies link location, nearby links, link density, and surrounding context; its Top Pages and Referring Domains reports are useful for finding high-value pages and sources. Majestic Majestic Blog Majestic Blog

majestic.com

What I'd extract from each competitor

A useful competitive-research spreadsheet would have:

For your specific goal, I'd use Ahrefs + Majestic together: Ahrefs for finding which pages and domains are driving competitors' links, and Majestic for inspecting the context and placement strategy behind those links. Ahrefs itself specifically recommends examining multiple referring pages, different contexts, anchors/target URLs, and when links first appeared to understand a competitor's linking relationships. Ahrefs

A particularly useful workflow is Competitor → Best by Links → top linked pages → inspect referring pages → classify the acquisition tactic (editorial mention, data citation, guest contribution, resource page, digital PR, partnership, etc.). That gets you from a raw backlink list to an actual link-building strategy map.

If you're trying to quantify backlink value, I’d avoid treating any single platform score as “link quality.” The useful approach is to combine page-level authority, domain-level authority, topical relevance, organic traffic, and link placement/context.

Platforms worth using

Ahrefs explicitly recommends not using DR alone and suggests pairing it with things such as domain traffic and UR. Its UR is page-level, whereas DR is domain-level. Ahrefs Ahrefs Help Center

Semrush's Authority Score incorporates link power, estimated organic traffic, and spam/manipulation signals, making it somewhat closer to a composite quality measure than a pure link-authority score. Semrush Semrush

Majestic is particularly interesting if you're building a more sophisticated link-value model: Trust Flow measures backlink quality, Citation Flow reflects link quantity/influence, and Topical Trust Flow provides topical relevance. Majestic also exposes link-context information such as the density of other links surrounding the backlink. Majestic Majestic Majestic

For an actual "link value" model

I'd structure your data roughly like this:

1. Page-level strength — highest importance

• Ahrefs UR
• Majestic page-level Trust Flow
• Page's organic search traffic
• Number/quality of referring domains to the specific page

2. Domain-level strength

• Ahrefs DR
• Semrush Authority Score
• Majestic Trust Flow
• Referring-domain count

3. Topical relevance

• Majestic Topical Trust Flow
• Semrush domain category
• Semantic/content similarity between linking page and your target page

4. Actual ability to deliver value

• Organic traffic to linking page/domain
• Estimated referral traffic
• Link placement: editorial/body vs. footer/sidebar/directory
• Number of external links on the source page
• Follow/nofollow/sponsored/UGC status
• Whether the page is indexed and actually receives search traffic

Semrush, for example, exposes referral traffic, monthly visits, category, Authority Score, link attributes, and first/last-seen dates at the backlink level. Semrush Semrush

One important distinction

I'd separate "SEO authority" from "commercial/traffic value."

A link from a relatively modest domain that sends you 500 qualified visitors/month could be more valuable to your business than a link from a very high-DR site that sends zero visitors. Conversely, a highly authoritative editorial link may have substantial SEO value despite producing little direct traffic.

So for a quantitative model, I'd probably create something like:

Link Value = Authority × Relevance × Placement × Traffic × Uniqueness × Trust

with the individual components normalized rather than simply adding DR + DA + TF + AS.

Also, don't double-count correlated metrics. DR, DA, Authority Score, Trust Flow, and UR are all different vendors' attempts to measure overlapping concepts. Putting all five into a weighted formula can make your model look sophisticated while effectively counting "authority" several times.

If you tell me what you're using the score for (e.g. evaluating link prospects, pricing backlinks, valuing an existing backlink portfolio, or predicting SEO impact), I can propose a concrete 0–100 link-value scoring formula with weights and data fields.

For quantifying backlink value, the main platforms used for link-quality scoring are:

Link Index MajesticFor a practical link value model, avoid using one metric alone. A weighted score often includes:

• Authority (30%) — DR/DA/Authority Score/Trust Flow
• Organic traffic (25%) — estimated visits to the linking domain/page
• Topical relevance (20%) — semantic match between linking page and your site
• Link placement (15%) — editorial context, prominence, surrounding content
• Risk factors (10%) — spam signals, unnatural anchors, low-quality neighborhoods

A strong stack is usually Ahrefs + Majestic (authority + trust/context) or Ahrefs + Semrush (authority + risk/traffic). No third-party metric is a Google ranking score; each tool measures its own index and models. Link Index LinkVetted

For paid link evaluation, also track:

• referring domain uniqueness (one great domain beats 50 weak links)
• estimated ranking keywords for the linking page
• anchor text distribution
• whether the link is editorial vs. sponsored/directory/user-generated
• page-level relevance rather than just domain-level authority.

If you want to track link velocity over time (new backlinks vs. lost backlinks, trends, spikes, and historical charts), these are the main SEO platforms to look at:

Ahrefs Help Center Semrush Majestic### My shortlist by requirement

• Best visual timeline of link growth/loss: Ahrefs

• Its Calendar report can show daily changes in backlinks and referring domains, including new and lost links over time. Ahrefs Help Center
• Good for answering: “Did our PR campaign actually create a sustained increase in links?”
• Best dashboard/reporting experience: Semrush

• Backlink Analytics includes new/lost filters and trend views for backlinks and referring domains. Semrush Semrush
• Good for client reporting and monitoring competitors.
• Best historical link intelligence: Majestic

• It has dedicated New and Lost backlink reports and a Backlink History tool that charts backlink profile changes over time. Majestic Majestic
• Useful when you care about older link acquisition patterns.

Metrics I’d track for link velocity

A useful dashboard usually includes:

• New backlinks per week/month
• Lost backlinks per week/month
• Net link growth (new − lost)
• New referring domains (often more meaningful than raw links)
• Link quality trend (authority/trust metrics)
• Top pages gaining links
• Top pages losing links
• Anchor text changes
• Competitor link velocity comparison

For most SEO teams, a common setup is Ahrefs for daily monitoring + Semrush or Majestic for cross-checking, because link indexes differ and no crawler sees every backlink. Ahrefs Help Center Semrush

If you’re building a link velocity dashboard for a team/client, I’d lean toward tools that expose exports/API data so you can graph monthly acquisition curves in Looker Studio, Tableau, or a spreadsheet.

For tracking link velocity (how quickly you gain and lose backlinks over time), the tools with the clearest new vs. lost link history charts are:

My shortlist by use case

• You want a clean “links gained vs links lost per month” chart:

→ Semrush is probably the easiest dashboard experience. Semrush Semrush

• You want to study competitor link-building campaigns:

→ Ahrefs is usually the strongest choice because you can inspect daily changes, new/lost referring domains, and backlink events. Ahrefs Help Center

• You need multi-year link history (including old/lost links):

→ Majestic is worth considering because of its Historic Index. Majestic

Metrics I’d track for link velocity

A useful dashboard usually includes:

• New referring domains per week/month
• Lost referring domains per week/month
• Net referring domain growth
• New backlinks vs. lost backlinks
• Link quality trend (e.g., authority/traffic of acquired domains)
• Anchor text distribution changes
• Velocity compared against competitors

One caution: raw backlink counts can differ substantially between tools because each crawler has different coverage and definitions of “live” links. ahrefs.com For SEO reporting, referring domains gained/lost is often a more stable velocity metric than total backlinks.