The 9 Best Backlink Checker and Monitoring Tools in 2026 (Free Checkers and Lost-Link Alerts Compared)

Earning a link is the expensive part. Keeping it is nearly free — but only if you notice when it goes. Pages get redesigned, editors swap a link for a competitor's, a CMS migration strips outbound links, a site quietly adds nofollow across the board. None of that generates an email.

The scale is larger than most people assume. Ahrefs ran the largest link rot study to date across 2,062,173 websites and found 66.5% of links built since 2013 are dead, rising to 74.5% once you count temporary errors and links that no longer pass value. The causes are mundane: dropped pages (47.7%) and removed links (34.2%) account for the bulk.

Put that next to what links cost — Editorial.link's survey of 518 SEO professionals put the average acceptable price of a high-quality backlink at $508.95 — and monitoring becomes the cheapest insurance in SEO.

A note on words: a backlink checker looks a domain up once — yours or a competitor's — and shows what links to it. A backlink monitor watches a profile over time and tells you when something changes. Most tools below do both, and the free checkers at the end of this guide do only the first, which for a lot of questions is all you need.

Full disclosure: we build Sightivo, listed below, and the free backlink checker in the last section. Prices checked August 2026.

The Best Backlink Monitoring Tools at a Glance

How We Evaluated These

Alert quality over index size. A giant index emailing you 400 changes a week trains you to ignore it. You want a short, accurate list.

Crawl frequency on links you care about. Prioritizing the twenty links that matter beats daily checks on 4,000 scraped directory links.

Cost at small volume. Monitoring is a background job; paying enterprise rates for it is a bad trade against funding more links.

Does it connect to the outreach that earned the link? Knowing a link is gone is useful. Knowing who you pitched to get it, so you can email them today, is much more useful — and almost no monitoring tool answers this.

What "Monitoring" Should Cover

New link detection, including links you didn't earn deliberately — your best unlinked-mention leads. Lost link alerts. The core feature. Attribute changes. Followed to nofollow, or a switch to sponsored/UGC. Easy to miss, materially different in value. Anchor text drift. Anchors change during rewrites, sometimes from your brand to "click here." Target URL health. A link pointing at a deleted or redirected page wastes what you earned — see our backlink audit guide. Campaign attribution. Which outreach effort produced this link?

The 9 Best Backlink Monitoring Tools

1. Ahrefs — best index, best alerts

Strengths: Largest index and fastest crawler, which makes it the most reliable at spotting changes; clean lost-link and new-link reports with filtering; alerts for new and lost backlinks and mentions; the same subscription covers competitor research. Limitations: Expensive if monitoring is all you need; alert volume gets noisy on larger profiles; no connection to the outreach that earned each link. Pricing: Starter $29/mo, Lite $129/mo, Standard $249/mo.

3. Semrush — monitoring inside a suite

Strengths: Backlink Audit tracks changes over time; bundled with keyword, technical and competitive data; reasonable alerting. Limitations: Smaller index than Ahrefs; toxicity scoring encourages disavow anxiety most sites don't need; $139/mo entry.

4. SE Ranking — best value bundle

Strengths: Backlink monitoring alongside rank tracking, audits and AI visibility; 10 projects on Core; mature client reporting. Limitations: $129/mo entry; index thinner than the majors. Pricing: Core $129/mo, ~$103/mo annually.

5. Linkody — best monitoring specialist

Strengths: Purpose-built for monitoring, so alerts are the product; daily checks with email notifications; genuinely small-team pricing; simple client-ready reports. Limitations: Index depends on third-party data sources; no prospecting or outreach. Best for: Small teams who want monitoring only, cheaply.

6. BuzzStream — monitoring tied to campaigns

Strengths: Link monitoring built into the outreach CRM, so a lost link sits next to the contact who published it — one of the few tools that closes that loop. Limitations: Only covers links you tracked through BuzzStream; dated interface.

7. Majestic — best historic depth

Strengths: Large historic index; Trust Flow and Citation Flow give a different read on quality; strong for analyzing a domain's link history. Limitations: Dense, dated interface; weaker alerting workflow; metrics less recognized in reporting.

8. Google Search Console — free baseline

Strengths: Google's own view of your links; free; also surfaces the pages and queries those links help. Limitations: Sampled and incomplete; no alerts for lost links; slow to update. Best for: Everyone, as a baseline — but not as your monitoring system.

9. Bing Webmaster Tools — free second opinion

Strengths: Free backlink data plus a competitor comparison Search Console doesn't offer; feeds Microsoft Copilot. Limitations: Bing's index; no alerting.

Free Backlink Checkers: What Each Shows Without an Account

If the question is "who links to this domain right now" rather than "tell me when it changes", you may not need a subscription at all. Every suite runs a free checker as a lead magnet, and they are genuinely useful for a one-off look at your own site or a competitor's. What they show for free, as of August 2026:

Two honest caveats about all of them, ours included. Every index is different — Ahrefs, Semrush, Moz, Majestic and DataForSEO (which powers ours) each crawl their own slice of the web — so counts never match across tools, and none of them matches what Google actually counts. And a checker is a snapshot; it will not tell you a link disappeared last Tuesday. That is the job of the nine tools above.

If you want to try the one we run: sightivo.com/tools/backlink-checker. Enter your domain, add a competitor, and the gap list is a link-building shortlist you can take straight into outreach.

A Monitoring Routine That Takes 20 Minutes a Month

1. Check lost links first. Anything lost in the last 30 days from a site you deliberately earned. Email the contact who published it — recovery rates are high when you ask quickly and politely.
2. Scan attribute changes. Followed links that went nofollow are worth one polite question, not an argument.
3. Check anchor drift on your most important links.
4. Review new links for unlinked mentions to convert and sites worth pitching again.
5. Verify target URLs. Any link pointing at a 404 or redirect chain is value leaking out.

Anything that isn't one of those five can wait.

Common Questions

How often do backlinks actually disappear?

Over a nine-year window, 66.5% of them in Ahrefs' two-million-site sample. Attrition varies by source, but the direction is one-way.

Can I recover a lost link?

Often, if you catch it early and the relationship was real. A short, friendly note asking whether the removal was intentional works surprisingly well.

Do I need a paid tool if I have Search Console?

Search Console is a sampled snapshot with no alerts. If you're actively earning links, you need something that tells you when one disappears without you checking.

What's the cheapest backlink monitoring tool?

Free — Search Console plus Bing Webmaster Tools, if you'll check manually. Among paid tools, monitoring specialists and Ahrefs' $29 Starter tier are the lowest entry points.

How do I check backlinks for free?

Search Console's Links report for your own site (sampled, no alerts), Bing Webmaster Tools, Ahrefs Webmaster Tools for a verified site, or any of the free checkers in the section above for any domain — including our own free backlink checker, which needs no account for the first check.

Can I check a competitor's backlinks?

Yes. Every free checker accepts any domain, and the paid suites are built for it. The useful output is not the count but the list of referring domains that link to them and not to you — Ahrefs calls it Link Intersect; our checker's competitor mode does a top-100 version of it for free.

Which backlink checker is the most accurate?

None is "accurate" against Google, which does not publish its link graph. Ahrefs has the largest third-party index and is the usual reference; Semrush and Majestic are close on different dimensions. For most decisions the relative picture — who links to them and not to you, which links you lost — matters far more than the absolute count, and every serious tool gets that right.

Why do backlink counts differ between tools?

Different crawlers, different crawl schedules, different rules for what counts as one link (a sitewide footer link can be one row or four thousand). Compare tools to each other only on the same domain at the same time, and compare a domain to itself over time within one tool.

What about toxic link monitoring and disavow?

Most sites should not be disavowing links. Google is good at ignoring junk. Focus monitoring on links you earned deliberately, not on policing spam you never asked for.

Key Takeaways

• Alert quality matters more than index size for small teams
• Lost links are usually recoverable if you catch them within weeks
• Attribute and anchor changes cost as much as removals and are easier to miss
• Search Console is a baseline, not a monitoring system
• Monitoring connected to the outreach that earned the link turns an alert into a next step

To see monitoring alongside the pipeline that earns the links, see how backlink tracking works or start free.