Frequently asked questions
Short answers about the score, the data, and what this site does and doesn’t do.
Is it really free?
Yes. Checking any domain is free without an account; a free account adds a dashboard for tracking domains over time. The data source is open, and so is the method.
Why does my domain have no score?
Because it has too little presence in the Common Crawl link graph for an honest number. We show the gap instead of estimating. New or very small domains usually appear in the graph once other sites link to them.
How often do scores update?
Common Crawl publishes a new domain graph roughly quarterly. Every known domain is re-scored automatically when a release lands, and each release becomes one point in the trend.
Is OAR comparable to Ahrefs DR or Moz DA?
No. Those are proprietary scores over private link indexes. OAR is computed from public data with a published formula. The scales look similar (0 to 100) but the numbers mean different things.
Can I raise my OAR?
Only the way authority actually grows: by earning links from domains that matter in the web graph. There is nothing to buy here, and scores are never adjusted manually.
Where does the data come from?
The domain-level ranks files that Common Crawl publishes with each crawl release, openly downloadable at commoncrawl.org. The exact formula is on the methodology page.
Why did my score change without my site changing?
OAR is relative to the whole graph of a release. When the web around you changes, or Common Crawl's crawl composition shifts, ranks move. That is also why trends matter more than single points.
Do you have an API?
Not yet. If you need programmatic access, the underlying Common Crawl files are public and the formula is published, so you can compute identical scores yourself today.