Compare up to six domains side by side — your site against competitors — with an estimated authority score (0–100), raw Open PageRank value, and approximate global rank for each, pulled live from the Open PageRank API.
Pro tip: This is an Open PageRank estimate, not Moz DA or Ahrefs DR. A missing record reflects provider coverage or freshness, so do not infer age, traffic, or quality from it.
Enter a domain and the tool returns an authority estimate on the familiar 0–100 scale. That number is derived from the Open PageRank API run by DomCop, which models a site's link-based importance across a large crawl of the web. It is not Moz's proprietary Domain Authority, it is not Ahrefs Domain Rating, and it is not the old public Google PageRank. Each of those providers crawls a different slice of the web and weights links with its own formula, so treat the figure you see here as one directional signal rather than a single source of truth.
Open PageRank itself is published on a 0–10 decimal scale. To make the result easier to read against the metrics people already know, the tool multiplies that value by ten and rounds it, so an Open PageRank of 4.1 becomes an authority estimate of 41. Alongside the converted score you get the raw 0–10 value and the domain's approximate global rank — the lower the rank number, the more prominent the domain — which together show exactly how the estimate was reached.
Enter one domain per line — your own site plus up to five competitors. The tool normalises whatever you type — a bare domain, a full URL, or an address with www — down to the registrable root domain, removes duplicates, and sends every domain to the Open PageRank endpoint in a single request. The response is read live each time, so you are seeing DomCop's most recent crawl data rather than a cached number stored on this site.
Results come back as a ranked, side-by-side comparison. The strongest domain is highlighted and badged at the top, with a score gauge showing its 0–100 authority. Below it, each domain gets its own bar — scaled against the highest score so the gap between sites is obvious at a glance — plus its raw 0–10 Open PageRank value and approximate global rank. Domains with no crawl data are listed too, clearly marked rather than silently dropped.
The biggest mistake is treating an authority estimate as a ranking forecast. It is a link-graph summary, not a prediction, and Google has repeatedly said it uses no single "authority score". A second trap is comparing this number directly against a Moz DA or Ahrefs DR you saw elsewhere and concluding one tool is wrong — they are simply different metrics built from different data, so they will rarely match. Finally, do not write off a domain just because no data comes back.
Authority scores are estimates built on crawled link data, so they lag reality and vary between vendors. A high score does not guarantee rankings, and a low score does not mean a site is bad — relevance, content quality, search intent, and technical health decide rankings far more than any single authority number. Open PageRank also returns no record for some domains because provider coverage and freshness are incomplete; that absence does not establish anything about age, traffic, quality, or penalty status. The tool does not see private analytics.
Input: example.com
Output: Estimated authority 61/100 · Open PageRank 6.12 / 10 · global rank #204
Measured 2026-07-17 against Open PageRank's 28th Mar 2026 crawl. Authority scores move in steps as DomCop refreshes its crawl, so expect this to drift over time.
Input: wikipedia.org gnu.org iana.org
Output: wikipedia.org 55/100 (strongest) · gnu.org 47/100 · iana.org 46/100
Measured 2026-07-17 (Open PageRank crawl of 28th Mar 2026). Side-by-side bars make the gap obvious; the raw values were 5.54, 4.67 and 4.61 out of 10.
No. Moz DA is a proprietary metric. This score is an estimate derived from the Open PageRank API, so the numbers will not match Moz exactly.
Open PageRank is published on a 0–10 scale. The tool multiplies that value by ten and rounds it, so an Open PageRank of 4.1 is shown as an authority estimate of 41.
Every provider crawls a different slice of the web and weights links differently, so authority estimates routinely disagree by several points or more.
Open PageRank has no record for some domains because its coverage and refresh cycle are incomplete. A missing record is not evidence that a domain is new, low-traffic, bad, or penalised.
It is the domain's approximate position in Open PageRank's ranking of all crawled domains. A smaller number means a more prominent domain.
No. Authority is one signal among many. Content relevance, intent match, and technical health usually matter more for a specific query.
Each check queries Open PageRank directly, so you see the provider's latest crawl data rather than a number stored here. The result shows the provider's last-updated date.
I document how each check works, where its data comes from, and which parts are only estimates.