Domain authority, from open data
The Open Authority Rating is a free 0 to 100 score computed from the public Common Crawl web graph. Reproducible by anyone, for any domain.
Free, no account needed. Built on Common Crawl, the same open corpus used in web research.
google.com
Open Authority Ratingcc-main-2026-apr-may-jun
Scored domains
How the score works
- 01Open source data. Common Crawl publishes a web-scale link graph with every crawl release, free for anyone to verify.
- 02Two graph signals.A domain’s harmonic-centrality and PageRank ranks in that graph combine into a single 0 to 100 score.
- 03Honest gaps. Domains without enough link-graph data show no number. We never estimate a rating.
The full method, formula included, is on the methodology page.
Not DR. Not DA.
OAR is not Ahrefs Domain Rating and not Moz Domain Authority, and it isn’t comparable to them. Those are proprietary scores over private link indexes; OAR is computed from public data with a published method.
| Property | OAR | DR / DA |
|---|---|---|
| Data source | Public Common Crawl graph | Private link indexes |
| Method | Published and versioned | Proprietary |
| Reproducible | Yes, by anyone | No |
| Missing data | Shown as a gap | Estimated |
Track your domains across releases
A free account gives you a dashboard with score history, per-release trends, and the change since you started tracking.