Free tools / Site Strength Checker
Site Strength checker
How well is a domain linked from the rest of the web? Enter any domain for a 0–100 score worked out from the public web link graph, plus the spam signals and domain age we can see from outside.
How the score is worked out
Common Crawl, a non-profit that crawls billions of pages, publishes a graph of which domains link to which, and ranks every domain by how central it is in that graph. We place the domain on a 0–100 log scale: 100 × (1 − ln(position) ÷ ln(119,700,000)). The best-connected domain on the web scores 100; the 10,000th scores about 50; the millionth about 26.
Site Strength is our own estimate from public data. It is not Moz Domain Authority or Semrush Authority Score, and it will not match them.