Free Referring Domains Tool: Track Unique Domains Linking to You
Enter any domain and see how many unique websites link to it in seconds, plus how that number has trended, so you can track real link profile growth.
Count Unique Linking Domains
One number that matters more than raw backlink totals: how many distinct sites link to you.
Spot Growth and Drops
Trend data shows whether your link profile is expanding, staying flat, or quietly losing domains.
Compare Any Two Sites
Check your domain and a rival's back to back to see who is earning new links faster in 2026.
A referring domains tool counts how many unique websites link to a domain, not just the total number of backlinks. That distinction matters, because fifty links from one site carry less weight than links from fifty different sites. The tool lists each linking domain with its authority and link count, giving you a clean picture of link diversity and a quick way to benchmark your backlink footprint against competitors.
What the Referring Domains Tool Reports
Enter a domain and the tool returns the list of unique sites linking to it, along with how many links each one contributes. You see the authority of every referring domain, whether the links are follow or nofollow, and often the trend in domains gained or lost over time. Separating referring domains from raw backlink counts reveals the true breadth of a link profile, since a high backlink number can hide a narrow set of sources. The report gives you both the headline count and the underlying detail, so you can judge not just how many sites link out but how strong and varied they are.
How to Act on Your Referring Domains
Start by checking your diversity, because a profile leaning on a few domains is more fragile than one spread across many. If most links trace back to a handful of sources, prioritize earning links from new, unrelated sites to broaden your footprint. Watch for lost referring domains too, since a dropping count can signal removed links worth recovering. Compare your list against a competitor's to spot domains linking to them but not you, which become clear outreach targets. Over time, aim for steady growth in relevant, authoritative referring domains rather than chasing a bigger raw backlink number that adds little real weight.
Who Relies on Referring Domain Data
SEO professionals use referring domain counts as a headline metric for off-page health, since it correlates more closely with rankings than total backlinks. Agencies report it to clients because it tells a clear growth story that is hard to inflate. Link builders track it to confirm their outreach is adding genuinely new sources rather than repeat links from the same sites. Competitive analysts use it to size up rivals quickly, comparing how many distinct sites vouch for each domain. Anyone judging the real strength of a backlink profile, rather than a vanity link total, will lean on this measure first.
Frequently Asked Questions
Why do referring domains matter more than backlinks?
Ten links from ten different sites usually signal more trust than a hundred links from one site. Search engines weigh the diversity of your linking domains heavily, so this count is a strong indicator of authority.
What counts as a referring domain?
A referring domain is a unique website that links to the site you check at least once. If the same blog links to you from five different articles, it still counts as one referring domain in your total.
Is the Referring Domains Tool free?
Yes. It is free after creating a Brainito account, and you can check your own site or any other domain as often as you like once you are signed in, with no usage caps to plan around.
See how many unique domains link to any site in seconds
One account unlocks referring domains tool plus 340+ marketing tools, weekly audits, and your action plan.
More Backlink & Authority tools
Browse all 340+ toolsAnchor Text Distribution Analyzer
Analyze your anchor text mix for over-optimization and keep your link profile looking natural
Backlink Audit Tool
Audit every link pointing to your site and spot the ones dragging your rankings down
Backlink Gap Analyzer
Reveal domains that link to your competitors but skip you, then turn them into outreach targets
Broken Backlink Finder
Find backlinks hitting dead pages on your site and recover that authority with simple redirects
Competitor Backlink Analyzer
Uncover every backlink powering your competitors so you can win the same sources faster
Disavow File Generator
Generate a Google-ready disavow file from your list of spammy links in a couple of clicks