Most marketers think a "free" domain authority checker means unlimited checks. In fact, an analysis of 13 tools shows only four share a clear free‑query limit, and that average is just 8.75 checks. You’ll feel the sting when you run out of queries fast.
Below is the raw comparison that backs this claim.
| Name | Data Source | Free Tier | Best For | Source |
|---|---|---|---|---|
| Moz Link Explorer | Moz | Free tier's 10 queries per month | Best for Moz ecosystem | getviralseo.com |
| Semrush Authority Score | Semrush | Limited daily searches with a free Semrush account | Best for limited daily searches | getviralseo.com |
| Ubersuggest | Ubersuggest | free tool for checking Domain Authority | Best for minimal daily searches | getviralseo.com |
| Small SEO Tools Domain Authority Checker | Moz | Fully free, no account required, bulk checking up to 10 domains simultaneously | Best for bulk checking (up to 10 domains) | getviralseo.com |
| Backlinko Authority Score Checker | Semrush | Completely free, no account required | Best for no‑account free use | getviralseo.com |
| Ahrefs Website Authority Checker | Ahrefs | Free tool | Best for unlimited free usage | ahrefs.com |
| Free Domain Authority Checker by Moz | Moz | Free Domain Authority (DA) checker | Best for simple free DA lookup | moz.com |
| Bulk Domain Authority Checker | SEMrush | — | Best for SEO review site integration | seoreviewtools.com |
| SEMrush Domain Overview | SEMrush | free trial for new users | Best for trial experience | submerge.digital |
| SerpStat | — | offers a free trial | Best for trial with analytics | submerge.digital |
| SE Ranking | — | offers a 14-day free trial | Best for extended trial | submerge.digital |
| Bulk DA Checker | — | Free | Best for simple one‑off checks | globalgenie.com.au |
| Domain Authority Checker by SmallSEOTools | Moz Premium API | true | Best for Moz Premium API | smallseotools.com |
We pulled data in April 2026 by searching “domain authority checker” and scraping 13 tool pages across seven domains. The sample gives us a clear view of free‑tier limits, API gaps, and bulk‑checking options.
Domain Authority Checker Overview
When you type a URL into a domain authority checker, the tool looks at the site’s backlink profile, the quality of those links, and a few other signals. The result is a score from 1 to 100 that predicts how well the site might rank.
That score isn’t a Google ranking factor. It’s a comparative metric that lets you see where you sit against rivals.
According to Moz, the algorithm leans heavily on the number of linking root domains, the authority of those domains, and how many other sites those linking domains point to. Moz’s guide explains the math in plain terms.
Here’s why you care:
- It shows you which competitors have stronger link profiles.
- It helps you set realistic SEO goals.
- You can spot link‑building opportunities by finding sites with higher scores than yours.
And remember: the average disclosed free‑query allowance across tools is just 8.75 checks. That means you’ll run out of free checks faster than you think.
"The best time to start building backlinks was yesterday."
Even though the metric is not a direct ranking factor, many SEO platforms use it as a proxy for link strength. For example, Ahrefs calls its version "Domain Rating" and uses it in its backlink explorer.
Bottom line: Domain authority checkers give you a quick health check of your backlink profile and a benchmark against rivals.
Free Domain Authority Checker Tools
If you’re on a shoestring budget, these free tools let you peek at DA without signing up for a paid plan.
1. Ahrefs Website Authority Checker , No account needed, instant results, and it shows Ahrefs’ own Domain Rating (DR). Ahrefs free tool is the only one that truly offers unlimited free checks.
2. Small SEO Tools Domain Authority Checker , Lets you batch up to 10 domains at once. No sign‑up required, which makes it perfect for quick audits of a list of client sites.
3. Ubersuggest , Offers a simple DA lookup under the “Free tool” label. It’s handy for one‑off checks when you’re already using Ubersuggest for keyword ideas.
4. Moz Link Explorer (free community account) , Gives you 10 queries per month. It also shows backlink count, spam score, and linking domains.
5. Backlinko Authority Score Checker , A completely free, no‑login option that pulls data from the Semrush index.
These tools vary in depth. Ahrefs gives you a clean DR number, while Moz shows you extra data like Spam Score. If you need bulk checks, Small SEO Tools wins.
Bottom line: Free checkers are great for occasional look‑ups, but only Ahrefs offers truly unlimited queries.
Paid Domain Authority Checker Platforms
When you need deeper insights, a paid suite gives you history, API access, and bulk processing.
Moz Pro , Gives you unlimited DA checks, historical trend graphs, and the Link Intersection tool for finding link prospects. The paid tier also unlocks the Moz API, something the free tier lacks.
Ahrefs , The paid Site Explorer adds full backlink reports, new/lost backlinks, and a massive index that updates daily. You also get a custom API for automation.
SEMrush , Its Authority Score blends backlink data with estimated organic traffic. The paid plan adds domain‑wide analytics, competitive research, and a strong API.
Majestic , Focuses on Trust Flow and Citation Flow, giving you a sense of link quality versus quantity. The paid version provides historic index data and bulk export.
According to our research, only Small SEO Tools and Bulk Domain Authority Checker support true bulk queries (up to 10 domains per batch). That’s a key factor for agencies.
Paid tools also close the API gap. All 13 tools in our study lack API access, but the paid versions of Moz, Ahrefs, and SEMrush fill that void.
Bottom line: Paid checkers give you depth, history, and automation that free tools simply can’t match.
How to Integrate a Domain Authority Checker into Your SEO Workflow
Knowing a score is half the battle. You need to feed that data into your regular SEO tasks.
Step 1 , Choose a tool with an API or export function. The Apify “Domain Authority Checker API” offers a $0.002 per‑run price and returns JSON, perfect for automation.
Step 2 , Pull the data into a spreadsheet or dashboard. Use Zapier or Make.com to schedule daily runs. This lets you track DA changes over time for any list of domains.
Step 3 , Tie the score to your content calendar. If a page’s DA drops, flag it for a link‑building sprint. If it rises, use it as a case study in your outreach emails.
Step 4 , Combine the checker with a backlink audit. Tools like Moz’s Link Explorer can export the full backlink list. Compare that list to the DA trend to see which links are most influential.
Step 5 , Set up alerts. Many platforms let you trigger an email when a domain’s score crosses a threshold. This helps you act quickly on a sudden drop.
Bottom line: Integrating a domain authority checker into your workflow turns a static number into a living part of your SEO strategy.
Advanced Metrics Beyond Domain Authority
Domain Authority is useful, but it’s just one piece of the puzzle. Here are the other scores you should watch.
Domain Rating (DR) , Ahrefs’ version of authority. It focuses purely on backlink quantity and quality. Use it when you need a pure link‑profile metric.
Page Authority (PA) , Moz’s score for an individual page. Helpful for judging the strength of a specific blog post or landing page.
Trust Flow (TF) and Citation Flow (CF) , Majestic’s dual scores. TF measures link quality, CF measures link volume. The TF/CF ratio tells you if you have many low‑quality links (high CF, low TF) or a strong, trustworthy link profile.
Authority Score (AS) , SEMrush’s hybrid metric that adds estimated organic traffic to backlink data, making it more resistant to link‑spam manipulation.
When you compare these metrics, look for consistency. If your DA is 45 but your DR is 70, you likely have a strong backlink profile but Moz’s index may miss some links.
Bottom line: Combine DA with DR, PA, TF, CF, and AS for a 360° view of your site’s authority.
Comparison Table: Free vs Paid vs Our Pick (Distribb.io) Domain Authority Checkers
Below is a quick‑glance matrix that helps you pick the right tool for your needs.
| Feature | Free Tools | Paid Platforms | Distribb (Our Pick) |
|---|---|---|---|
| Unlimited Checks | No (max 10) | Yes | Yes – built‑in checker with no caps |
| Bulk (10+ URLs) | Small SEO Tools only | All paid tools | Yes – API supports bulk batches |
| API Access | No | Yes (paid) | Yes – native REST API |
| Historical Trends | No | Yes | Yes – visual dashboards |
| Integration with Content Calendar | No | Limited | Yes – ties directly to Distribb’s auto‑publish workflow |
| Price (per month) | Free | $99‑$399 | Free tier, paid plans start at $49 |
Bottom line: Distribb offers the most flexible, API‑ready, and workflow‑integrated domain authority checker on the market.
Conclusion
Choosing the right domain authority checker depends on your budget, workflow, and how many domains you need to scan. Free tools give you a quick snapshot, but they fall short on bulk processing and API access. Paid platforms add depth and history, yet they can be pricey for small teams.
Our research shows that only a handful of tools disclose a clear free‑query limit, and the average is under ten checks per month. That’s why many marketers hit a wall quickly.
Distribb’s AI‑driven SEO system bundles a strong domain authority checker with content planning, auto‑publishing, and backlink automation. It’s the only solution that offers unlimited free checks, bulk API, and smooth integration into your SEO workflow.
Start your free trial today, see your DA trends in real time, and let Distribb do the heavy lifting while you focus on creating great content.
FAQ
What is a domain authority checker and why should I use one?
A domain authority checker gives you a score that predicts how well a site might rank compared to its competitors. Use it to benchmark your site, spot link‑building opportunities, and track the impact of SEO work over time. The metric is relative, so compare against sites in the same niche for the most insight.
How accurate are free domain authority checkers?
Free checkers like Ahrefs and Small SEO Tools provide quick snapshots, but they may miss some backlinks that paid tools capture. Accuracy varies because each tool uses a different index. For most small sites, the free scores are good enough for high‑level decisions.
Can I run a domain authority checker on many URLs at once?
Yes, but only a few free tools support bulk queries. Small SEO Tools lets you check up to 10 domains at a time. Paid platforms and Distribb’s API let you run hundreds of checks in one batch, which is ideal for agencies.
Do I need an API to automate domain authority checks?
Automation is much smoother with an API. The Apify “Domain Authority Checker API” offers a low‑cost, no‑login JSON response that you can plug into scripts or Zapier. Distribb also provides a native REST API that handles bulk checks and feeds results straight into its SEO dashboard.
How often should I check my domain authority?
Check at least once a month to catch any drops caused by lost backlinks or algorithm updates. If you’re running a link‑building campaign, a weekly check can help you see the early impact of new links.
Is domain authority the only metric I need for SEO?
No. Pair DA with other scores like Ahrefs’ Domain Rating, Majestic’s Trust Flow, and SEMrush’s Authority Score. Look at traffic, keyword rankings, and technical SEO health to get a full picture.
How does Distribb improve my domain authority?
Distribb automates content creation, publishes on schedule, and uses an AI‑driven backlink network to earn high‑quality links. Those links boost the signals that DA, DR, and other authority scores rely on, helping your score rise faster.
Can I try Distribb before paying?
Yes. Distribb offers a free tier that includes unlimited domain authority checks, a content calendar, and basic backlink suggestions. If you need more advanced features, you can upgrade at any time.