Best competitor backlink checkers compared, and what a link gap report can and cannot show

Checking a competitor's backlinks is the one job in this category that nobody gives away, and the reason is structural rather than commercial. Your own link data can be handed to you the moment you prove you own the domain. A rival's link profile is the finished output of a crawl of the whole web, which is the expensive thing the vendor built, so that is the thing it sells.

This page compares the tools on one criterion, applied to everybody including us: what does the vendor publish about the crawl behind the answer, and what does it publish about who may see a domain they do not own?

What each vendor publishes about competitor data

How to read a link gap report without drawing the wrong conclusion

A gap report takes three or four competitor domains, finds the referring domains that link to some of them and not to you, and hands you the list. It is the single most useful report in link building, and it is also the one most often misread.

Three things it shows well. Which publications in your category link to vendors like you at all, which is the real question behind most prospect lists. Which directories and association pages your rivals have all joined and you have not. And which single domain links to every competitor, because that is usually a category roundup worth being in.

Three things it does not show. Why the link exists, which is often a client relationship, a paid placement or a founder's own guest post rather than anything you can replicate. When it was placed, so a 2019 link from a publication that has since changed owner looks identical to one won last month. And whether it passes anything, since a gap list mixes followed and nofollowed links unless you filter them.

The workflow that turns the list into work: pull the gap across three rivals, keep only domains linking to two or more of them, drop everything that is a syndicated press release wire, and sort what remains by whether a named human is reachable on the page. That last filter removes more rows than any metric threshold and it is the one that predicts a reply.

Where every tool here beats us, said plainly

We have no crawl, no index and no competitor link report, and on the subject of this page all four tools above are ahead of us because they built the infrastructure and we did not. Anyone who came here to pull a rival's link profile should buy one month of Ahrefs or Semrush and export it.

On procurement, the same honesty applies. Our rendered pricing page shows no SSO, no white label, no SOC 2 and no ISO line, and covers one business per plan outside the agency tier, which covers ten.

The competitor comparison nobody in this table runs

There is a second place your competitors are beating you and no link index records it. When a buyer asks an assistant who to use, the assistant writes one answer and names two or three businesses. Your rival may be in that answer every time and you may be in none of them, and your link profile can be the stronger of the two while that happens, because the two things are decided by different inputs.

That comparison is the thing we measure. AI Knows Us asks the buyer questions you choose across ChatGPT, Gemini, Perplexity, Claude and Google AI Overviews, reports which businesses the answer named and lists the sources behind it. The published arithmetic, on the rendered pricing page: one credit is one buyer question asked on one AI app once, most checks use one credit, a Claude check uses 3, checking 10 questions on 4 AI apps uses 40 credits. The same page states the rule that keeps the comparison fair, and it is published rather than claimed: the buyer questions never name the business being measured. The US floor is $149 a month on SEO Start, which llms.txt states watches 0 buyer questions on 0 engines, so Growth at $299 is the cheapest plan that reads all five surfaces.

Ahrefs runs this job too and beats us on two published counts: Brand Radar states each prompt is checked daily on every selected platform where we publish weekly on priority questions, and it covers AI Mode and Copilot, which we do not read. Rankscale names more engines than either of us, nine on its pricing page, and publishes a REST API and the removal of its branding from shared dashboards, neither of which we offer. The one criterion where our published figure is the most exact is the cost of the expensive engine: Ahrefs states Claude consumes 8 checks per update, Rankscale publishes a flat typical 0.25 credits per engine per prompt with no per engine weight, and we publish the exact weight in credits.

Competitive research on the keyword side has the same shape as the link side, and the same trap of mistaking a data dump for a plan. That argument is worked through in our piece on competitor keyword spy tools, and the workflow that turns the data into a plan. We measured durable inbound links ourselves on 21 October 2026, reading 2,169 stored bodies (1,797 drafts plus 372 fetched) against all 2,082 pages tracked on this site: 932 of them, 44.8% of 2,082, carry no inbound link written into another page's body. No other page on this site links to that one.

Questions buyers ask about competitor backlink tools

Can I check a competitor's backlinks without paying?

Only a headline number. Ahrefs states that unverified competitor analysis needs a paid subscription, Majestic offers a demo search on one site every few days, and Search Console covers only domains you own. A free lookup gives you a count; a paid export gives you the prospect list.

How many competitors should go into a gap report?

Three, and they should be real rivals rather than the biggest brands in the category. Adding a national publisher to the set fills the output with links no business your size will ever get.

Which is better for competitor links, Ahrefs or Semrush?

They publish different kinds of claim, so pick on refresh or on breadth. Ahrefs publishes 493 B pages with a 15 minute refresh; Semrush publishes more than 43 trillion backlinks refreshed at least hourly. For a one off prospect pull either answers it. For monitoring a rival monthly, the refresh interval is the number to buy on.

Does a gap report tell me which links to go after first?

It tells you which domains are reachable in principle. Order them yourself by whether a named person is contactable on the page, because that predicts a reply better than any authority score in the export.

What competitor comparison is missing from all of these?

Whether the assistants name your rival and not you when a buyer asks who to use. That answer is written per asker, differs by app and country, and leaves no link in anybody's index, so it has to be asked for directly.