Domain Authority Checker: The Best Free Tools to Check Your DA Score, and How to Actually Use Them
You need to check your domain authority. You type “domain authority checker” into Google and find yourself looking at a page full of tools, some free, some behind a paywall, some asking for an email address before they show you anything. Several of them look identical. None of them explains why the number they return might be different from the number another tool gave you yesterday.
That confusion is worth clearing up before you check anything, because how you read the result matters as much as the result itself. A domain authority score without context is just a number. With the right context, what it measures, which tool produced it, and how it compares to the sites you are actually competing with, it becomes something you can act on.
This article covers the best free domain authority checker tools available today, explains what each one is showing you and where its data comes from, and walks through how to turn a DA check into a genuinely useful competitive exercise rather than a one-off number-collecting session.
Before You Check Anything: Why Different Tools Return Different Numbers
There is one thing worth understanding before you open any domain authority checker, because it resolves the most common confusion people encounter in the first five minutes: different tools give different scores for the same website, and that is not a bug.
Every major SEO platform has built its own version of a domain authority score. Moz calls theirs Domain Authority. Ahrefs calls theirs Domain Rating. Semrush calls theirs Authority Score. These are not the same metric under different names; they are independently calculated figures, each built from a different web crawl, using a different algorithm, updated on a different schedule.
A site that scores DA 42 on Moz might score DR 58 on Ahrefs. Both numbers are accurate on their own terms. They are simply different estimates of the same underlying concept.
Free tools like SmallSEOTools do not calculate their own score from scratch. They pull from an existing source, typically Moz’s API, and surface those results in their own interface. The number you see there is Moz’s number, not a separate calculation. Once you know which source a free tool is drawing from, its results become much easier to interpret and trust.
The rule that prevents most DA confusion: always compare scores from the same tool. A Moz DA compared to an Ahrefs DR for the same site is not a contradiction. It is two different lenses on the same website.
The Main Tools: What Each One Is and What It Actually Shows
With that foundation in place, here is a clear picture of the tools worth using, what each one measures, where its data comes from, and what it is best suited for. The cards below are designed to sit alongside each other so the differences are immediately visible.
SmallSEOTools DA Checker
Best for: Quick free checks with no account required. Bulk checking multiple domains simultaneously without a paid Moz subscription.
What it shows: DA score, Page Authority (PA) score, and the number of external links Moz has indexed for the domain. Supports checking up to ten domains at once.
What it does not show: Backlink data, referring domain breakdown, link quality analysis, or any context that explains why the score is what it is. It surfaces the number only.
Moz Free Domain Checker
Best for: Anyone tracking DA as their primary metric. The most direct source for DA scores with the most complete free-tier overview.
What it shows: DA score, PA score, number of linking domains, number of inbound links, and a snapshot of the top sites linking to the domain. No account required for a basic check.
What it does not show: Deep link-by-link analysis and historical DA trend data, which require a paid Moz Pro subscription.
Ahrefs Website Authority Checker
Best for: Teams working in Ahrefs as their primary platform. Also, the better choice when referring to domain count and link quality distribution matters alongside the score.
What it shows: DR score, number of backlinks, number of referring domains, and a distribution of how many links come from high-DR vs low-DR sources, more context than most free checkers provide.
What it does not show: Historical trend data and deep backlink analysis without a paid Ahrefs subscription.
Semrush Domain Overview
Best for: Cross-referencing a link-based score against traffic data. Useful when you want to know whether a site’s authority reflects genuine audience reach or just accumulated links.
What it shows: Authority Score alongside organic traffic estimates, top keywords, and referring domain count. A broader site health picture than a link-only score provides.
What it does not show: Full data access requires a Semrush account. Free checks are available but limited in depth.
Majestic Free Checker
Best for: Link prospecting and profile quality assessment. Trust Flow measures the credibility of inbound links. Citation Flow measures the volume. Used together, they reveal sites where link volume is high, but quality is low, a useful red flag.
What it shows: Trust Flow, Citation Flow, and a topical trust profile showing which industries are sending links to the domain.
What it does not show: Standard DA or DR scores. Majestic uses its own proprietary framework rather than the Moz or Ahrefs scale.
The MozBar: DA Scores Without Leaving Google
Alongside the standalone checkers, there is one browser tool worth installing if you do regular competitive research. Moz’s MozBar Chrome extension displays domain authority and page authority scores directly inside Google search results as you browse. When you search for a keyword and see a list of results, each result shows its DA and PA score underneath it.
This makes competitive DA assessment during keyword research seamless. Rather than copying domains into a separate checker, you see the authority landscape of the results page in real time. It is free to install and requires no subscription for basic scoring.
How to Run a Useful Domain Authority Check
Knowing which tools to use is only part of the picture. The other part is running the check in a way that produces something you can act on, rather than just a number you are not sure what to do with. Most people check DA in isolation, their own site, one number, no reference point. The five-step process below turns that isolated check into a competitive exercise with clear output.
Five steps to a useful DA check:
Check your own domain first: Run your site through your chosen tool and note the score, the referring domain count if visible, and the date.
This is your baseline. Write it down; the value comes from tracking it over time, not from the number itself.
Identify your five closest competitors: These are the sites ranking for the keywords most important to your business right now.
Not the biggest names in your industry in general, specifically the sites occupying the top positions for your target search terms.
Run all five through the same tool: Use the same checker for all five that you used for your own domain. This keeps all scores on the same scale and makes the comparison meaningful.
Mixing tools here, checking your DA on Moz and your competitor’s DR on Ahrefs, produces a comparison that will mislead you.
Compare the range, not the individual number: The DA range across those five sites is the authority threshold you are actually competing against. If they sit between DA 35 and DA 55, and your domain is DA 28, that gap is specific and actionable. If your DA is 43 and they average 45, domain authority is probably not the primary lever to pull.
Repeat monthly with the same competitive set: A single check is a snapshot. Monthly checks from the same tool, applied to the same five competitors, over six to twelve months gives you a trend line.
A rising trend while competitors stay flat is a meaningful signal. Flat movement while a new competitor climbs is worth investigating.
What the Number Cannot Tell You
Before this article closes, it is worth being direct about one thing, because the tools in this series are good enough that it is easy to over-read their output.
A domain authority checker tells you the estimated strength of a website’s backlink profile as calculated by whichever tool produced the score. That is the beginning and the end of what it measures.
It does not tell you why a specific page ranks where it does. It does not reflect Google’s assessment of your site. It does not account for content quality, search intent alignment, technical performance, or user behaviour signals, all of which influence rankings independently and significantly.
A lower-DA site outranks a higher-DA site for a specific keyword regularly and predictably, when the lower-authority site has addressed that keyword more thoroughly, more relevantly, and more accurately.
Domain authority is one input. Use it alongside organic traffic data, keyword rankings, and content quality signals rather than as a standalone verdict on why your site is or is not ranking.
The Short Version
For a fast, free check with no signup needed, SmallSEOTools is the most accessible option and pulls directly from Moz’s data. For the most complete free-tier view of DA, including top linking domains and referring domain count, Moz’s own checker is the right tool.
For Domain Rating alongside referring domain data and link quality distribution, Ahrefs’ free checker adds more context than most alternatives. For a cross-reference that includes traffic signals, Semrush’s Domain Overview rounds out the picture. And for link profile quality specifically, Majestic’s Trust Flow and Citation Flow scores are worth running alongside whichever primary score you track.
Whichever tool you choose, the habit that makes it useful is consistency: the same tool, the same competitive set, every month. A number in isolation tells you almost nothing. A trend compared against the sites you are actually competing with, tracked over six to twelve months, tells you a great deal. For the full picture on what domain authority is, how it is calculated, and how to improve it, the pillar article and other cluster articles in this series cover each topic in depth.
FAQ
What Is Domain Authority (DA)?
Domain Authority (DA) is a score developed by Moz that predicts how likely a website is to rank in search engine results. The score ranges from 1 to 100, with higher numbers indicating stronger ranking potential based on factors like backlinks and overall site quality.
How to Check a Domain Authority?
You can check Domain Authority using SEO tools provided by Moz, such as the Moz Link Explorer or MozBar browser extension. Other platforms like Ahrefs and SEMrush can also provide similar authority metrics for websites.
Should I Focus on DA or DR?
Both Domain Authority (DA) from Moz and Domain Rating (DR) from Ahrefs measure the strength of a website’s backlink profile. Instead of focusing on just one metric, it’s better to monitor overall SEO performance, backlink quality, and search visibility on Google.
How to Check DA and PA?
You can check both Domain Authority (DA) and Page Authority (PA) using tools from Moz, such as Moz Link Explorer or MozBar. Simply enter the website URL, and the tool will display the DA score for the domain and the PA score for individual pages.
