Domain Authority Checker Free Tool

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About Domain Authority Checker

What This Tool Actually Does

Type or paste a domain into the box above, submit it, and this tool returns a single authority-style score for that domain on a 0-10 scale, pulled live from the Open PageRank API, along with a plain-language label (Low, Medium, or High authority) and the domain's global Open PageRank rank position. That's the whole job: one domain in, one score out, checked fresh every time you submit rather than pulled from a stored snapshot.

Before going any further, one thing needs to be said plainly, because the tool's own name invites a reasonable but wrong assumption: this is not Ahrefs' Domain Rating (DR) and it is not Moz's Domain Authority (DA). Those are two specific, trademarked, proprietary metrics, each built on its own company's crawled backlink index, and neither is something a free tool can compute without paying for that company's API.

This tool measures something related but genuinely different, called Open PageRank, an open, freely available link-graph score built in roughly the same spirit as the original Google PageRank concept. The full comparison, including why the numbers from these tools are never directly interchangeable, gets its own dedicated section further down this page, and it's worth reading before you use a score from here in any real decision.

Here's the short version of why this tool exists in its current form. This site used to run several authority-style checkers built around Alexa Rank and Moz's free API tier. Alexa.com shut down entirely in 2022, and Moz's free tier has been progressively restricted since, which broke those older tools in ways that couldn't be quietly patched. Rather than leave dead tools live or fake a result, this page was rebuilt around Open PageRank specifically because it's free, it's real, and, as of this writing, it works. That's the honest reason this tool uses the data source it uses, and it's a decision the rest of this page tries to be transparent about rather than obscure.

Where "PageRank-Style" Scoring Actually Comes From

The word "PageRank" gets thrown around loosely in SEO content, so it's worth being precise about where it comes from and why it's relevant here. The original PageRank algorithm was a core part of how Google's search engine ranked pages, and for years Google exposed a simplified public version of it, a 0-10 score, through the Google Toolbar. That public-facing score was retired in 2016; Google stopped updating and displaying it, though the underlying concept, ranking pages by how they're linked to across the web, kept evolving internally as one signal among Google's many ranking factors, which today are far more complex than a single link-based number.

Open PageRank is a separate, independently run project, not a Google product and not affiliated with Google. It picked up the same basic idea, a link-graph-based authority score on a familiar 0-10 scale, and built it as an open, publicly queryable API using openly available link data rather than Google's own private index. That's a meaningfully different thing from what Google's original toolbar score was, and it's also a meaningfully different thing from Ahrefs' or Moz's proprietary metrics, which is exactly why the comparison section further down this page exists.

What Open PageRank shares with the old Google toolbar score is mostly the format, a familiar 0-10 number that's easy to read at a glance, not the underlying data or company behind it.

Understanding that history matters practically: if you've seen an old blog post or forum thread reference "checking a site's PageRank" from years ago, this is the closest thing to that idea still freely available today, but it's an independent revival of the concept using open data, not a resurrected version of Google's original score.

How the Score Is Calculated, Step by Step

Here's what actually happens between submitting a domain and seeing a result, described the way the code behind this page runs it, not as a generic explanation of how a "domain checker" is usually built.

1. Your input is validated. Whatever you type is trimmed, and if it doesn't already start with http:// or https://, a scheme is added automatically so the value can be parsed as a proper URL. If what's left still doesn't validate as a real URL, the tool stops immediately with an error and nothing is fetched, no API call, no wasted request.
2. A rate limit check runs before anything else. This tool caps requests at 10 per minute, per IP address. The counter is tracked by minute and resets automatically at the start of the next one; there's no manual reset step and no persistent ban, just a short wait. Go over the cap and you'll see: "Too many requests. Please wait a minute and try again." This exists specifically to protect the free Open PageRank API key behind this tool from being hammered by automated scripts, not to punish normal manual use, and a person checking a handful of domains one at a time will essentially never see it.
3. The host is extracted from your input. Once a domain or URL passes validation, only the bare host (the part like example.com) is pulled out and used for the lookup; whatever path, query string, or subpage you may have pasted is discarded, since Open PageRank scores are calculated at the domain level, not per-page.
4. A live request goes to the Open PageRank API. The tool calls Open PageRank's public endpoint over HTTPS with an authenticated request, waits up to 25 seconds total for a response, and reads back whatever that API currently has on file for the domain. Nothing about this step is cached on this site's end; every submission is a fresh call.
5. The response is checked for a genuine, valid result. The API returns its own internal status marker for the lookup, and this tool only proceeds if that marker confirms success. If the API has no data for the domain, if the request fails outright, or if the response comes back malformed, the tool does not guess or estimate a score. It shows an honest error instead: "Unable to fetch the authority score right now. Please try again later." A missing or failed lookup is never silently turned into a fabricated "0" or a fake placeholder number.
6. A valid result is converted into what you see on screen. The raw score Open PageRank returns (a decimal between 0 and 10) is displayed to two decimal places, e.g. 4.10 / 10, next to a plain-language label, and the domain's global Open PageRank rank position is shown alongside it, or N/A when the API doesn't return a rank for that particular domain, which typically happens for very low-traffic or effectively unindexed domains.

There's no login requirement and no captcha gate on this specific tool's form, and, again, no caching layer of any kind: every single submission triggers a live call to Open PageRank, so what you see reflects that service's currently published data at the moment you asked, not a snapshot from an earlier day.

How to Use This Tool

1. Open the page and find the input box. It accepts a domain or a full URL; either works, since only the host portion is actually used for the lookup.
2. Type or paste the domain you want to check. A bare domain like example.com is enough; you don't need to include https://, though it's fine if you do.
3. Submit the form. The tool sends your input through validation and, if it passes, straight into a live Open PageRank lookup.
4. Read the result. You'll see the domain name, its Open PageRank score out of 10 with a High/Medium/Low authority label, and its global Open PageRank rank position (or N/A if none is available for that domain).
5. Check another domain if you need to compare. There's no limit on how many different domains you can check in a session, only the 10-per-minute rate limit described above, so a quick run through five or six link-building prospects in a row is exactly the kind of normal use this tool is built for.
6. If you see a rate-limit or fetch error, just wait a minute and retry. Both error states are temporary by design; neither one means anything is broken on your end.

Reading Your Result: Score, Label, and Global Rank

Every successful check returns three pieces of information, and each one means something slightly different.

The label mapping is fixed and applied consistently to every result, not adjusted per-domain or per-niche:

Worth knowing: because these are fixed cutoffs applied the same way regardless of niche or site type, a genuinely small but well-run niche blog can land in the same "Low authority" bucket as a domain with almost no real content at all. The label is a rough triage bucket, not a verdict on quality, and it should nudge you toward a closer manual look rather than substitute for one, especially anywhere close to a boundary line like a 2.9 versus a 3.1.

It's also worth being clear about what "high" and "low" mean in context here. Because Open PageRank's scale runs 0-10 across the entire indexed web, a genuinely huge, globally recognized site (a major news outlet or a top-tier tech platform) will typically sit well up in the High range, often close to the top of the scale, while the large majority of small and mid-sized independent sites, blogs, and niche businesses cluster somewhere in the Low-to-Medium range even when they're perfectly healthy, legitimate, actively growing sites.

A Medium or even a Low score is not automatically a red flag for a smaller site; it's simply where most of the web sits relative to the handful of domains with an enormous, decades-old inbound link footprint.

Open PageRank vs. Ahrefs Domain Rating vs. Moz Domain Authority — Know the Difference

This is the single most important section on this page to read before using a score from this tool in any real decision, because these three names get used loosely and interchangeably online in a way that genuinely misleads people.

Three things follow directly from that table, and they're worth stating without hedging.

• Different data sources produce different scores for the same domain, and that's expected, not a bug. Open PageRank, Ahrefs, and Moz each crawl and index the web independently. None of them sees the exact same set of links, so a domain that looks strong to one may look average to another. Seeing three different numbers for the same site across three different tools doesn't mean one of them is broken.
• There is no fixed conversion formula between the scales. A 5.0 on Open PageRank's 0-10 scale is not "the same as" a 50 DR or a 50 DA. You'll find informal conversion charts floating around the web claiming otherwise; treat any of them skeptically, because the underlying methodologies simply aren't built to line up that neatly.
• The tool's own name uses "Domain Authority" in the plain-English, generic sense of the phrase, not as a claim to reproduce Moz's specific trademarked metric. Moz's Domain Authority is a specific, proprietary product name; this free tool doesn't have access to Moz's crawled index or their machine-learning model, and it isn't attempting to approximate either one. It measures Open PageRank and reports that, clearly labeled as such.

None of this means Open PageRank is a lesser or less useful signal, only a genuinely different one. If you need a certified DR or DA number for a client report or a high-stakes purchase decision, that number has to come from Ahrefs or Moz directly, because it's calculated from data only those companies have. If you want a free, fast, directional read on a domain, especially when you're screening a long list of candidates and a paid API call per domain isn't practical, Open PageRank via this tool is a genuinely useful, real signal for that narrower job.

A practical way to think about the three side by side: Ahrefs DR and Moz DA are closer to specialist instruments, expensive to access at scale, built on deep proprietary crawls, and best suited to situations where the accuracy and vendor backing actually matter, a client deliverable, a competitive audit you're being paid to produce, a large budget decision. Open PageRank, accessed here for free, is closer to a general-purpose gauge: quick to read, costs nothing, and good enough for the much more common day-to-day question of "is this domain even in the right ballpark before I spend more time on it." Neither replaces the other; they answer different-sized questions.

Why an Authority-Style Score Is Useful for SEO

Comparing link-building and guest-post prospects

When you're looking at a list of potential guest-post or link targets, a quick authority-style score gives you a fast first filter before you invest time in outreach, useful mainly because manually reviewing every candidate in depth simply isn't practical once a list runs to ten, twenty, or fifty prospects gathered from a competitor's backlink profile or a niche directory. The specific score ranges worth prioritizing and the exact workflow for running that screening pass are covered in "Using This Score in Real Link-Building Work" further down this page; the point here is the category of problem this kind of score solves, narrowing a long list down to a shorter one worth a closer look.

A quick sanity check before deeper backlink research

A single score isn't a substitute for actually reviewing a domain's real backlink profile, traffic, and content, but it's a reasonable first pass that costs nothing and takes seconds. If a domain scores unexpectedly low relative to how it presents itself, polished design, confident marketing copy, a large-looking content library, that's worth investigating before, not after, you commit real time to it. Sometimes a low score on a domain that otherwise looks established points to something worth knowing early: a recent domain change, a history of penalties, or simply a site that's newer than it appears to be.

Tracking your own domain's trend over time

Because every check here is a live, uncached lookup, checking your own domain periodically, say once a month or once a quarter, gives you a rough directional read on whether your link profile appears to be growing in Open PageRank's own open link graph specifically. It's one data point among several worth tracking, not the whole picture on its own, and it's most useful watched over time rather than judged from a single snapshot; one month's number in isolation tells you far less than a consistent upward or downward trend across several checks.

A Worked Example: Screening Three Prospects

To make the practical value concrete, here's a hypothetical walkthrough (the domains and numbers below are illustrative examples, not real measured results for any actual site) of how a quick screening pass might look when you're deciding which of several guest-post prospects to pursue first.

Note what this example does and doesn't do. It gives you a fast first sort, three domains ranked roughly by an authority-style signal in seconds, at zero cost, and without needing a paid API key of your own. It does not tell you whether site-b-example.com is actually about your topic, whether site-c-example.com is a brand-new legitimate blog worth an early relationship or an abandoned domain, or what any of the three looks like when you visit them. That's the manual step that still has to happen after the score, not instead of it, covered in the next section.

Using This Score in Real Link-Building Work

Practical ways to use it

• Screen a batch of guest-post or link targets quickly. Run each candidate domain through the tool one at a time (mindful of the 10-per-minute rate limit) before deciding which ones deserve real outreach effort.
• Prioritize outreach when you have limited time. Start with domains that score in the Medium or High range, since they're statistically more likely to be established, actively maintained sites rather than abandoned or thin ones.
• Spot obviously low-authority or spam-adjacent domains fast. A domain scoring near zero with no global rank at all is often, though not always, a newly registered, abandoned, or link-farm-style site; treat that as a prompt to look closer, not as an automatic disqualification, since genuinely new legitimate sites will also score low simply because they're new.
• Pair the score with a manual look before committing budget. Before paying for a guest post or a placement, actually visit the domain, check whether it publishes real content, and glance at its traffic if you have access to a traffic-estimation tool. The score narrows your list; it shouldn't make the final call by itself.

What this score can't tell you

A single number is a rough directional signal, not a full site-quality audit, and it's worth being specific about what it leaves out. It doesn't measure how good the content on a domain actually is. It doesn't measure real organic search traffic. It doesn't tell you whether a domain is topically relevant to your niche, which matters enormously for link value regardless of the raw authority number.

And it doesn't check for spam signals, like a domain stuffed with paid link placements or built purely as a private blog network node, the kind of thing that can score deceptively well on a pure link-graph metric while being a genuinely bad link source in practice. Treat this score as one input among several, not the deciding factor on its own.

Building it into a repeatable screening process

If you evaluate link prospects regularly, it's worth turning this into a lightweight, repeatable step rather than an occasional one-off check. A practical version of that process looks like: keep a running spreadsheet of prospects, run each new one through this tool as it's added (batching a handful at a time comfortably fits inside the 10-per-minute rate limit), record the score and label alongside your own notes on topical fit and content quality from a quick manual visit, and only move a prospect to active outreach once both the automated score and your own eyeball check line up reasonably well.

This keeps the score from becoming either the whole decision or an ignored afterthought — it sits where it's useful, as one fast, free, repeatable input feeding into a judgment you still make yourself.

Related Tools

A domain's authority-style score is only one piece of evaluating whether it's a solid link target or a domain worth watching. These related tools on this site cover other angles worth checking alongside it.

• Fast Backlink Indexer — once you've landed a link on a domain that checked out well here, this tool submits that new backlink for faster discovery, so the link starts counting sooner instead of waiting to be crawled naturally.
• Broken Links Checker — before committing to a guest-post or link target, it's worth running the prospect's own page through this tool; a site riddled with its own dead links is a real, practical signal of neglect worth weighing alongside its authority score.
• Class C IP Checker — when you're evaluating several link prospects at once, this tool shows whether they sit on the same hosting IP block, a real link-diversity consideration that a single authority score alone won't reveal.

Frequently Asked Questions

Is this the same as Ahrefs Domain Rating or Moz Domain Authority?

No. This tool measures Open PageRank, a different, open, freely available metric built on a different link-graph data source than either Ahrefs' or Moz's proprietary crawls. The scales aren't the same either: Open PageRank runs 0-10, while DR and DA both run 0-100. See the comparison section above for the full breakdown.

Why does this tool's score look different from what I see on Ahrefs or Moz for the same domain?

Because each service indexes and calculates from its own independent data. Different underlying link graphs naturally produce different numbers for the same domain across different tools; that's expected, not an error in any one of them.

How often does the score update?

Every single check is a live call to the Open PageRank API at the moment you submit it; nothing here is cached or stored from an earlier lookup. The number you see reflects that service's currently published data for the domain.

Is there a limit on how many domains I can check?

Yes, a rate limit of 10 requests per minute per IP address, tracked automatically and reset every minute. Normal manual use, checking a handful of domains in a row, will essentially never hit that limit; it exists mainly to stop automated scripts from hammering the tool.

Why does a domain sometimes show "N/A" for its global rank?

Open PageRank doesn't return a rank position for every domain it scores, typically because the domain has too little data (low link volume or traffic) for a stable rank to be calculated. The score itself can still be valid even when the rank shows N/A.

Why did I get an error instead of a score?

Either your input failed URL validation (check for typos), you hit the per-minute rate limit (wait a minute and retry), or the Open PageRank API had no data or didn't respond for that specific domain. In the last case, the tool shows an honest error rather than guessing at a number.