Best Free Domain Authority Checker Tools in 2026: 7 Options Compared
Check the strength of a website using popular SEO metrics such as Domain Authority, Domain Rating and Authority Score. These free tools can help you compare competitors, evaluate backlinks and understand the relative strength of websites in your niche.
Updated: September 2026What Is Website Authority?
Website authority is a general SEO concept used to describe the relative strength of a domain.
SEO platforms estimate this strength using their own data and algorithms.
The metrics often consider factors connected to backlinks, such as:
- Number of referring domains
- Quality of linking websites
- Strength of the backlink profile
- Link distribution
- Spam or manipulation indicators
- In some tools, estimated organic traffic
Because every SEO company calculates its score differently, authority metrics should normally be used for comparisons rather than treated as absolute measurements.
Best Free Domain Authority Checkers: Quick Comparison
| Tool | Metric | Scale | Free Access | Best For |
|---|---|---|---|---|
| Ahrefs Website Authority Checker | Domain Rating (DR) | 0–100 | Yes | Fast authority checks |
| Moz | Domain Authority (DA) | 1–100 | Limited free access | Checking traditional DA |
| Semrush | Authority Score | 1–100 | Free checker available | Links + traffic + spam signals |
| Ubersuggest | Domain Authority | SEO metric | Limited | Beginner-friendly SEO research |
| Ahrefs SEO Toolbar | DR & UR | 0–100 | Yes with free account | Authority while browsing |
| Small SEO Tools | DA/PA-style checks | Varies | Free | Quick bulk checks |
| PrePostSEO | DA/PA-style metrics | Varies | Free tier | Basic authority checks |
7 Best Free Domain Authority Checker Tools in 2026
Ahrefs Website Authority Checker
Domain Rating Backlinks FreeAhrefs provides one of the easiest completely free website authority checkers.
Enter almost any domain and the tool returns its Domain Rating (DR).
DR measures the relative strength of a website’s backlink profile on a 0-to-100 scale.
Ahrefs calculates it using factors such as the number of unique websites linking to a domain, the authority of those linking domains and how many other websites those referring domains link to.
The score is logarithmic, meaning moving from a low DR to a moderate DR is easier than moving from an already strong DR to an extremely high one.
✓ Free authority checker
✓ Check almost any domain
✓ Strong backlink database
✓ Simple DR score
✓ No paid subscription needed
✕ Shows DR, not Moz DA
✕ Backlink focused
✕ Not a Google metric
Moz Domain Authority
DA Moz Link ResearchMoz created the metric that many marketers specifically mean when they say Domain Authority.
Moz DA is designed to estimate the ranking strength of an entire domain relative to other websites.
The metric is commonly used when:
- Comparing competing domains
- Evaluating potential link opportunities
- Monitoring domain growth
- Researching websites in a niche
Free Moz access is more limited than its paid SEO products, but it remains the correct source when you specifically want the Moz DA metric.
✓ Original Domain Authority metric
✓ Widely recognized
✓ Useful competitor comparison
✓ Link research ecosystem
✕ Free access is limited
✕ DA is not a Google score
✕ Should be compared within similar niches
Semrush Authority Score
Authority Score Traffic BacklinksSemrush uses its own proprietary metric called Authority Score.
It evaluates several aspects of a domain rather than relying only on the raw number of backlinks.
Current Semrush documentation says the score considers:
- Link power
- Estimated organic traffic
- Natural backlink-profile signals
- Potential spam or manipulation indicators
Semrush reports Authority Score on a 1-to-100 scale and recommends using it primarily for relative comparison between domains.
✓ Includes backlink quality
✓ Includes organic traffic signals
✓ Checks spam-profile indicators
✓ Good for competitor comparison
✕ Not Moz DA
✕ Not directly comparable to Ahrefs DR
✕ Detailed analysis may require paid access
Ubersuggest
Domain Analysis Backlinks SEOUbersuggest provides beginner-friendly domain analysis that combines website authority information with backlink, traffic and keyword data.
It is useful when you want more context than a single authority number.
A domain overview can help you examine:
- Domain authority-style metrics
- Estimated organic traffic
- Organic keywords
- Backlinks
- Top-performing pages
Free access is limited, but the tool can still be useful for occasional competitor checks.
✓ Beginner friendly
✓ Backlink analysis
✓ Traffic estimates
✓ Keyword information
✓ Useful all-in-one overview
✕ Daily/free limits
✕ Full reports require paid plan
✕ Metric is not Google’s authority score
Ahrefs SEO Toolbar
Chrome Firefox DR URIf you regularly research websites, the Ahrefs SEO Toolbar is an efficient way to check authority without repeatedly opening a separate website checker.
With a free Ahrefs account, the toolbar can display:
- Domain Rating (DR)
- URL Rating (UR)
It also contains useful on-page SEO utilities for checking page elements, redirects, HTTP headers, canonicals and other information.
This makes it particularly useful for competitor research and manual SERP analysis.
✓ Free DR and UR metrics
✓ Works while browsing
✓ Chrome and Firefox
✓ Useful SEO inspection tools
✕ Requires extension installation
✕ Uses Ahrefs metrics only
✕ Some advanced metrics need paid access
Small SEO Tools Authority Checker
Free Bulk Checking Quick ResearchSmall SEO Tools provides various free utilities designed for quick SEO checks.
Its authority-checking tools can be useful when you need to inspect several domains without using a full professional SEO platform.
However, remember that third-party websites may rely on data supplied by other sources or their own processing.
For critical SEO decisions, confirm important metrics directly through the company that owns the metric whenever possible.
✓ Easy free access
✓ Simple interface
✓ Useful for quick checks
✓ Bulk options may be available
✕ Not the original source of DA or DR
✕ Data freshness can vary
✕ Confirm important scores directly
PrePostSEO Authority Checker
DA Checker Bulk Domains Free TierPrePostSEO offers another simple authority-checking utility for users who want fast domain comparisons.
It can be useful when reviewing a list of websites for outreach, competitor research or basic link analysis.
As with other third-party authority checkers, use it as a convenient screening tool rather than assuming every displayed metric is identical to information from the original metric provider.
✓ Quick checks
✓ Simple interface
✓ Useful for domain lists
✓ Free access available
✕ Third-party metric source
✕ Free limits can apply
✕ Data can differ from original providers
Domain Authority vs Domain Rating vs Authority Score
Moz’s proprietary domain-level authority metric. Use DA when comparing websites using Moz’s own link data and methodology.
Ahrefs measures the relative strength of a domain’s backlink profile on a 0-to-100 scale.
Semrush combines backlink strength with estimated organic traffic and signals designed to detect unnatural backlink profiles.
What Is a Good Domain Authority Score?
There is no universal number that automatically makes a website “good.”
Authority metrics are much more useful when compared with websites in the same niche.
For example, if most new websites in your niche have DR scores between 5 and 15, a DR of 20 may already indicate a relatively strong backlink profile.
But if your competitors are major publications with scores above 80, the same DR 20 would represent a very different competitive position.
Which Authority Checker Should You Use?
Is Domain Authority a Google Ranking Factor?
No third-party DA, DR or Authority Score should be treated as Google’s own ranking score.
These metrics are created by SEO companies to help users compare websites using their databases and formulas.
A high authority score can often be associated with websites that have strong backlink profiles, but the score itself does not make Google rank the site higher.
This distinction is especially important when buying services or evaluating backlink offers.
Can You Increase Domain Authority?
You generally improve authority-style metrics by strengthening the underlying factors that those tools measure.
That can include:
- Earning backlinks from relevant websites
- Publishing useful resources people naturally reference
- Creating original research or statistics
- Building useful free tools
- Improving digital PR
- Fixing broken backlink targets
- Creating stronger internal linking
Do not make increasing a third-party number your only SEO goal.
A website with useful content, growing search traffic and relevant links is more valuable than a site created simply to inflate an authority score.
How Long Does It Take to Increase DA or DR?
There is no fixed timetable.
Authority metrics can change when:
- You gain new referring domains
- You lose backlinks
- The SEO provider recrawls websites
- Competitor backlink profiles change
- The provider updates its index or scoring system
Because these scores are often relative, your score can even move when other websites become stronger.
Does a High Authority Score Guarantee Rankings?
No.
A strong domain can still fail to rank for a keyword when:
- The page does not satisfy search intent
- The content is outdated
- The page has technical problems
- The topic is not relevant to the site
- A competing page provides a better answer
Authority is only one part of a much larger SEO picture.
How to Use Authority Metrics for Competitor Research
Step 1: Identify actual search competitors
Search your main keywords and record the websites that repeatedly rank.
Step 2: Check their authority
Use Ahrefs, Moz or Semrush to compare scores.
Step 3: Check their backlinks
Authority becomes more useful when you understand what created it. Look at referring domains and strong backlinks.
Step 4: Compare content quality
Do not judge competitors only by their authority score.
Step 5: Look for realistic opportunities
If weaker domains already rank for a keyword, that may indicate an opportunity for a newer website with better content.
Should You Buy Backlinks Based on DA or DR?
No. A high authority score alone does not prove that a backlink is valuable.
Before evaluating a website, also check:
- Whether it has real organic traffic
- Whether its content is relevant to your niche
- Whether pages are indexed
- Whether it publishes obvious link-selling content
- Whether the backlink fits naturally
- Whether the website has a suspicious link profile
Our Recommended Free Authority-Checking Stack
For most website owners, this combination is enough:
- Ahrefs Website Authority Checker – quick DR check
- Moz – check actual Moz DA when needed
- Semrush – compare Authority Score and site quality
- Ahrefs Backlink Checker – inspect the links behind the score
- Google Search Console – monitor the performance of your own site
The most important lesson is to avoid relying on one number. Authority becomes much more useful when combined with backlinks, organic traffic and content quality.
More Free SEO Tools
Frequently Asked Questions
What is the best free Domain Authority checker?
If you specifically need Moz Domain Authority, use Moz. If you want a fast free measure of website authority, Ahrefs Website Authority Checker is an excellent option and reports Domain Rating.
What is the difference between DA and DR?
DA is Moz’s Domain Authority metric. DR is Ahrefs’ Domain Rating metric. They both use a 100-point-style scale but use different databases and calculation methods, so the scores are not directly interchangeable.
Is Ahrefs Website Authority Checker free?
Yes. Ahrefs provides a standalone free Website Authority Checker that reports Domain Rating for websites.
Is Ahrefs DR a Google ranking factor?
No. Domain Rating is an Ahrefs metric used to evaluate the strength of a backlink profile. It is not an official Google ranking metric.
What is Semrush Authority Score?
Authority Score is Semrush’s proprietary metric for estimating the overall quality and SEO strength of a website or page. Its calculation considers link power, estimated organic traffic and signals associated with unnatural link profiles.
What is a good Domain Rating?
There is no universal good DR. Ahrefs recommends evaluating it relatively by comparing your site with similar competitors in the same market.
Can DA or DR decrease?
Yes. Authority metrics can change because of lost links, changes in other domains, index updates and changes in the provider’s data or methodology.
Should I choose backlinks based only on DA?
No. Check relevance, real traffic, content quality, backlink profile and the site’s legitimacy. An authority score alone is not enough to judge whether a backlink is valuable.