Vetting a guest-post site
Input: example-blog.com
Output: Estimated authority 41/100 · Open PageRank 4.10 / 10 · global rank #482,300
Mid-range authority — worth a closer manual look at relevance and real traffic before outreach.
Domains Tools
Domain Strength Checker
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.
Step by step
How to use the Domain Strength Checker
- Enter your domain plus a few competitors — one per line, up to 6
- Click "Compare domain strength" to pull live Open PageRank data for all of them at once
- Read the side-by-side bars: the strongest domain is badged and the gauge shows its Authority (0–100)
- Compare each domain's Open PageRank and global rank to see where you stand
Pro tip: This is an Open PageRank estimate, not Moz DA or Ahrefs DR. Domains with no data are usually new or low-traffic — not necessarily weak.
What the score really is
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.
How the lookup works
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.
Where authority checks help
- Triaging guest-post and outreach prospects so you spend time on the stronger candidates first.
- Comparing a shortlist of competitors at a glance before a deeper manual review.
- Sanity-checking an expired or aftermarket domain you are thinking of buying.
- Tracking the rough trajectory of your own domain over months as you build links.
How to read authority sensibly
- Compare like with like — a new niche blog and a national newspaper will sit far apart, and that is expected.
- Watch the trend over months, not day-to-day wobble, because crawl data updates in steps.
- Use it to shortlist link prospects, not to predict whether a single page will rank for a query.
- Read the global rank next to the score; two domains with the same estimate can have very different reach.
Common mistakes
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.
Honest limitations
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 data for some domains: that is normal for new, low-traffic, or recently registered sites and does not mean the domain is penalised. The score uses publicly published Open PageRank data, so this tool does not see your private analytics; if you need a vendor's official figure, check it in that vendor's own product.
Worked examples
Real domains, side by side
Comparing a shortlist at once
Input: yoursite.com site-a.com site-b.com
Output: site-a.com 58/100 (strongest) · yoursite.com 41/100 · site-b.com 22/100
Side-by-side bars make the gap obvious: Site A leads, and Site B may still fit if its content is tightly relevant.
A brand-new domain
Input: my-week-old-store.com
Output: No authority data returned yet for this domain
Expected for fresh domains — Open PageRank simply has not crawled enough links yet.
FAQ
Domain Strength Checker — questions & answers
Is this the same as Moz Domain Authority?
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.
How is the 0–100 score calculated?
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.
Why does the score differ from another tool?
Every provider crawls a different slice of the web and weights links differently, so authority estimates routinely disagree by several points or more.
Why did I get no data for my domain?
Open PageRank has no figure for some domains. That is normal for new, low-traffic, or recently registered sites and does not mean the domain is bad or penalised.
What does the global rank mean?
It is the domain's approximate position in Open PageRank's ranking of all crawled domains. A smaller number means a more prominent domain.
Does a higher score mean I will rank higher?
No. Authority is one signal among many. Content relevance, intent match, and technical health usually matter more for a specific query.
Is the data live or cached on this site?
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.
Site standards
How HighSEOTools handles data and methodology
Our editorial and data-source notes explain how each check works and where estimates come from.