Is Open PageRank really free?

Yes, entirely, with an API key from DomCop and a limit of 100 domains per request. There is no paid tier and no subscription.

How accurate is the score?

Less well correlated with ranking ability than Moz DA or Ahrefs DR, because it is built on open Common Crawl data rather than a proprietary crawl. Good enough to filter obvious junk, not good enough for final judgment calls.

Can it replace Moz Domain Authority?

No, for two reasons: the correlation is weaker, and nobody in an outreach conversation recognises the number. Use it as a free first pass and reserve DA for decisions and client-facing work.

How often is the data updated?

It follows Common Crawl's release schedule, so it can lag current reality by months. For established domains that rarely matters; for recently launched ones it does.

Open PageRank API review

Free authority scores

Reviewed by Eugene SuslovUpdated August 2026No affiliate links

Open PageRank publishes a free domain authority-style score derived from Common Crawl's open web data, and lets you look up 100 domains per request at no cost. For anyone qualifying a large list of link prospects, that is a genuinely useful zero-cost first pass.

It is not as well correlated with ranking as Moz's Domain Authority or Ahrefs' Domain Rating, and nobody in an outreach conversation will recognise the number. But it is free, and it is enough to throw away the obvious junk before you spend credits on a paid metric.

Who Open PageRank API is for

Link builders and prospecting tools that need to filter thousands of domains cheaply. Use it as a coarse first pass, then spend paid credits only on what survives.

Strengths and limits

What it does well

Genuinely free with no subscription, which is unique among authority metrics.
Bulk lookups of 100 domains per request make large list filtering practical.
Built on Common Crawl, so the methodology is open rather than proprietary.
Trivially easy to integrate, with no commercial negotiation attached.

Where it falls short

Weaker correlation with actual ranking ability than Moz DA or Ahrefs DR.
Nobody recognises the score, so it is useless as a shared vocabulary in outreach.
Update cadence follows Common Crawl releases, so it can lag reality by months.

Open PageRank API pricing

Free, with a maximum of 100 domains per request and an API key from DomCop. There is no paid tier.

The sensible pattern is a funnel: filter thousands of prospects here for nothing, then spend Moz or Majestic credits only on the shortlist that survives. That can cut a paid metrics bill dramatically on large prospecting jobs.

Verdict

Free, coarse and genuinely useful in the right place. It will not replace Domain Authority or Trust Flow for judgment calls or client conversations, but as a zero-cost filter ahead of paid metrics it can save real money on any large prospecting workflow.

Visit Open PageRank API

Open PageRank API FAQ

Is Open PageRank really free?
Yes, entirely, with an API key from DomCop and a limit of 100 domains per request. There is no paid tier and no subscription.
How accurate is the score?
Less well correlated with ranking ability than Moz DA or Ahrefs DR, because it is built on open Common Crawl data rather than a proprietary crawl. Good enough to filter obvious junk, not good enough for final judgment calls.
Can it replace Moz Domain Authority?
No, for two reasons: the correlation is weaker, and nobody in an outreach conversation recognises the number. Use it as a free first pass and reserve DA for decisions and client-facing work.
How often is the data updated?
It follows Common Crawl's release schedule, so it can lag current reality by months. For established domains that rarely matters; for recently launched ones it does.

This is an independent review. We have no affiliate relationship with Open PageRank API, earn nothing if you sign up, and no provider pays for placement in the directory. Prices were read from the vendor's own pages in August 2026 and change without notice.