Ahrefs SEO Toolbar vs MozBar: Head-to-Head Comparison 2026
Two of the most popular free SEO browser extensions — but they serve very different purposes. Here's an honest, feature-by-feature breakdown of which to install and when to use each.
Ahrefs Toolbar: best free technical SEOMozBar: best free authority metrics
Ahrefs SEO Toolbar
by Ahrefs Pte. Ltd.
4.5
Overall score
VS
MozBar
by Moz
4.1
Overall score
Free Features
On-page auditAhrefs
Authority overlayMozBar
SERP overlayMozBar
Technical SEO
Redirect tracerAhrefs
Link checkerAhrefs
HTTP headersAhrefs
Browser Support
ChromeBoth
FirefoxBoth
SafariAhrefs only
Data & Metrics
Link data (free)MozBar DA/PA
Link data (paid)Ahrefs DR/UR
AccuracyAhrefs
Full Feature Comparison
Feature
Ahrefs Toolbar
MozBar
Winner
On-page SEO report (free)
✓ Full — titles, metas, H-tags, canonicals
Limited without Pro
Ahrefs
Authority overlay (free)
✗ DR/UR requires paid
✓ DA/PA shown on every page
MozBar
SERP metrics overlay (free)
✗ Paid only
Free Moz account needed
MozBar
Redirect chain tracer
✓ Full chain visualised
✗ Not available
Ahrefs
Broken link checker
✓ Highlights on any page
✗ Not available
Ahrefs
HTTP header reader
✓ Full response headers
✗ Not available
Ahrefs
Country switcher for Google
✓ 170+ countries
✗ Not available
Ahrefs
Core Web Vitals check
✓ Built-in
✗ Not available
Ahrefs
Spam score
✗
✓ Free
MozBar
Chrome support
✓
✓
Tie
Firefox support
✓
✓
Tie
Safari support
✓
✗
Ahrefs
No account required
✓ Full free features
Partial — account for SERP
Ahrefs
Data index size (paid)
✓ Largest in industry
Smaller index
Ahrefs
Update frequency
✓ Faster crawl
Slower
Ahrefs
When to Use Each Tool
Use Ahrefs Toolbar when…
Checking redirect chains and status codes
Auditing on-page SEO of any page
Finding broken links on a site
Changing Google country for keyword research
Reading HTTP response headers
You're on Safari (MozBar doesn't support it)
You want zero account setup
Use MozBar when…
Qualifying link prospects by DA/PA
Doing bulk SERP authority analysis
Checking spam score of potential link sources
You prefer Moz's link index data
You want authority scores without paying Ahrefs
Comparing domain authority across multiple sites quickly
Data Accuracy: Ahrefs DR vs Moz DA
This is the most common question. Domain Rating (Ahrefs) and Domain Authority (Moz) are both proprietary scores — neither is a Google metric. They measure different things and use different link graphs.
Ahrefs' link index is generally considered the largest and most frequently updated in the SEO industry. DR tends to reflect link quality changes faster. Moz's DA is more established as a metric (it's been around since 2008) and is still widely used as a common language for authority in link-building conversations.
In practice: if you're making link-building decisions, both are useful reference points. If you need to choose one paid tool for backlink research, Ahrefs has the larger index. If you just want a free authority indicator on every page, both MozBar (DA) and a free Moz account (SERP overlay) do the job.
Final Verdict
Install Ahrefs Toolbar first — it provides more free value with no account required: redirect tracing, broken link checking, on-page audits, Core Web Vitals, and country switching all work out of the box. Then add MozBar if you regularly need DA/PA overlays for link prospecting. They don't conflict and each fills a gap the other doesn't cover. Together they form the best free SEO extension stack available in 2026.
Frequently Asked Questions
For technical SEO (redirects, broken links, on-page audits), Ahrefs Toolbar wins clearly — it offers more free features with no account. For authority metric overlays, MozBar shows DA/PA for free while Ahrefs DR/UR requires a paid subscription. Most professional SEOs install both since they cover different workflows.
Yes. Ahrefs Toolbar and MozBar don't conflict. A common setup: keep Ahrefs Toolbar on by default for technical work, and toggle MozBar on when doing link prospecting or competitor research. Both can be pinned to the Chrome toolbar.
For backlink data, Ahrefs has the larger and more frequently updated link index. Ahrefs DR/UR (paid) reflects real-time changes more accurately. Moz's DA/PA updates less frequently but is widely understood as a benchmark. For free data, both are directional indicators — neither is a Google signal.
No. Ahrefs Toolbar's free features (on-page audit, redirect tracer, link checker, country switcher) work without any account. MozBar's DA/PA overlay works without an account; the SERP overlay needs a free Moz account. You can use both tools entirely for free for most everyday SEO tasks.