Free domain authority checker
See any website's Gridlode Authority score (0-100), its global rank among 135 million domains, PageRank and how many domains link to it, from the Common Crawl web graph.
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Need this at scale?
The same lookup is one API call at 1 credit / request (one credit is $0.0003 to $0.001 depending on volume), with failed requests free.
curl "https://api.gridlode.com/v1/domain/authority?domain=wikipedia.org" \
-H "Authorization: Bearer $GRIDLODE_KEY"FAQ
How is the authority score calculated?
We rank every domain in the Common Crawl web graph by harmonic centrality (how close it is to every other site through links) and convert the rank to 0-100 on a log scale: rank 1 scores 100, rank 10,000 scores 50 and rank 1,000,000 scores 25.
Is this the same as Moz DA or Ahrefs DR?
No. It is our own open, documented score from public crawl data, so the numbers differ, but it ranks sites in a similar way and the formula is published.
How often is it updated?
With each Common Crawl web graph release, roughly every quarter. The response tells you which release it comes from.