SEO data that doesn't cost $129 a month
Check any domain's authority and backlink profile against an independent index of 118 million domains and 7.1 billion links. The basics are free and always will be — no account, no card, no trial countdown.
Domain Authority Checker
Most usedAuthority score, referring domains and global rank for any website.
Backlink Checker
See which domains link to a site, sorted by how strong they are.
Link Intersect
Rarely freeFind sites that link to your competitors but not to you — the highest-hit-rate outreach list there is.
Why we can give this away
The expensive part of an SEO tool isn't the software — it's crawling the web. We don't crawl it. We build on Common Crawl, an open dataset that already covers billions of pages, so serving one more lookup costs us close to nothing.
What you get free
Authority scores, referring domains, link intersect, global ranks — for any domain, as often as you like.
What we charge for
Things that cost us money every time they run: continuous monitoring, rank tracking, keyword volumes, scheduled audits and alerts.
What we won't pretend
Our link data refreshes with each Common Crawl release, not hourly. If you need links discovered this morning, Ahrefs is genuinely better. We'll say so.
Only 7 domains on the entire web score 90 or above
We measured the authority distribution of all 118 million domains in our index. The results contradict the usual advice: sites in the 30–39 band have a lower median number of referring domains than sites in the 20–29 band. More links is not the same as more authority.
Read the study| Authority | Domains | Median ref. domains |
|---|---|---|
| 0–9 | 82,480,000 | 1 |
| 20–29 | 2,660,000 | 22 |
| 40–49 | 64,500 | 660 |
| 70–79 | 244 | 116,680 |
| 90+ | 7 | 11,500,000 |