Dossier
Domain Authority Checkers: Moz DA vs Ahrefs DR vs Majestic CF
Domain authority checkers estimate a site’s link-based strength using proprietary metrics like Moz DA, Ahrefs DR, Majestic CF, and Semrush Authority Score. These tools are useful for relative benchmarking but should not be treated as interchangeable truths.
- Effort
- Low – enter a domain and get a score
- Cost
- Free to $119.95/month
- Policy risk
- Low – third-party metrics, not Google signals
- Best for
- Relative benchmarking and link prospecting
Desk ranking
Top Domain Authority Checkers: Moz DA vs Ahrefs DR vs Majestic CF
Our ranked comparison helps you choose the right tool for benchmarking link authority.
Moz
Score 9.5
Moz created the DA metric, and it's still the most recognized name in authority benchmarking. The free tool gives you a quick number without login, but you'll need a subscription for anything deeper. For a detailed comparison of DA and DR, see our guide on DA vs DR.
- Most recognized authority metric
- Free no-login checks
- Long-standing industry reference
Best for: Buyers who want the canonical DA reference and a familiar benchmark
Ahrefs
Score 9.2
Ahrefs' DR is built on one of the largest backlink indexes. The free checker gives you a quick DR, but you'll need a paid plan for the full backlink analysis. SEOs who care about index depth often prefer Ahrefs. For a broader look at backlink analysis tools, see our Backlink Analysis Tools comparison.
- Large backlink index
- Fast free authority check
- Comprehensive SEO suite
Best for: Teams comparing authority against a strong link index and DR
Majestic
Score 8.8
Majestic's Trust Flow and Citation Flow give you a trust-vs-quantity perspective that Moz and Ahrefs don't. It's less mainstream but essential for link quality assessment. The free tier is limited; paid plans unlock deeper link intelligence. For more on backlink profile tools, check our Backlink Profile Tools guide.
- Unique TF/CF metrics
- Deep link intelligence
- Useful for trust analysis
Best for: Link builders and SEOs focused on trust and citation patterns
Semrush
Score 8.5
Semrush's Authority Score combines backlink data with organic traffic signals. It's a mixed metric, not a pure link authority score. Useful for holistic screening, but less reliable for link-specific evaluation. The free tool is limited; full analysis requires a paid plan. For a broader look at SEO toolkits, see our Backlink Analysis Tools.
- Combines backlink and traffic data
- Free basic tool
- Part of a comprehensive SEO suite
Best for: Holistic SEO audits where authority and traffic signals are both needed
Analysis
How Domain Authority Checkers Work
Domain authority checkers are simple on the surface: you type in a domain, they query their index, and spit out a score. The complexity is in the proprietary formulas and crawl data behind that number. Moz's DA predicts ranking potential. Ahrefs' DR measures backlink profile strength. Semrush's Authority Score blends backlinks with organic traffic. Majestic's Trust Flow and Citation Flow separate trust from quantity. None of these are Google ranking factors. They're estimates. Good for comparison, not for certainty.
Each vendor uses its own data and model. A DA 40 is not a DR 40 is not a TF 30. For a deeper technical breakdown, see DA vs DR SEO Metrics.
Analysis
Comparison of Major Domain Authority Checkers
Below is a ranked comparison of the major domain authority checkers. I've ranked them based on data depth, transparency, and practical utility for link building. The key takeaway: scores from different vendors are not interchangeable. Use the table to find the right tool for your workflow.
| Tool | Metric | Free access | Paid starting price | Data / capability | Best use | Accuracy / caveat |
|---|---|---|---|---|---|---|
| Moz | Domain Authority (1–100) | Yes, limited free checker | $99/month | DA, PA, spam score, backlink context | DA benchmarking and client reporting | Native DA is the original metric, but still only a proxy for ranking. |
| Ahrefs | Domain Rating (0–100) | Yes, basic free exposure | $99/month | Deep backlink index, referring domains, DR | Link building, prospecting, competitor comparison | Strong for backlink analysis; DR is not DA and should not be cross-compared 1:1. |
| Semrush | Authority Score (0–100) | Yes, limited free tool | $119.95/month | Authority Score plus backlink and traffic signals | Mixed SEO and authority screening | Useful when you want authority plus traffic signals; not a pure link metric. |
| Majestic | Trust Flow / Citation Flow (0–100) | Limited free access | $49.99/month (Lite) | Trust-oriented link metrics and topical analysis | Quality-vs-quantity link evaluation | Good for link quality inspection; scores are different from DA/DR and require interpretation. |
| SEO Review Tools | DA/PA-style checker | Yes | Not specified | Bulk checking, competitor comparison, averages | Fast bulk benchmarking | The site itself advises that good DA is relative to organic competitors; accuracy is approximate. |
| SmallSEOTools / DA PA Checker variants | DA/PA style output | Yes | Not specified | Bulk URLs, export, additional link fields | Quick one-off screening | Useful for volume checks, but these are utility layers around third-party metrics, not a source of truth. |
Sources are listed at the bottom of this page for transparency.
Analysis
When to Use Each Checker
Moz DA: Use when stakeholders expect the original metric. Good for client reporting and quick benchmarking.
Ahrefs DR: Ideal for link building campaigns and competitor analysis. Its large index makes it reliable for prospecting.
Semrush Authority Score: Useful for holistic SEO audits where you want authority combined with organic traffic data. Good for screening domains before investing in content or outreach.
Majestic Trust Flow / Citation Flow: Best for evaluating niche relevance and trust networks. Use it when you need to separate link quantity from link quality.
For advanced workflows, combine these with backlink analysis tools and manual backlink audits.
Analysis
Limitations and Risks
- Score interchangeability: Treating one vendor's score as equivalent to another's is a common mistake. The formulas and data sets differ.
- Misleading high scores: A high DA/DR/CF can be inflated by spammy or manipulated links. Always inspect the backlink profile manually. A high DR is useful. It is not a certificate of good behavior.
- Buying links based on scores alone: Purchasing links purely because a domain has a high authority metric wastes budget. The metric is a proxy, not a ranking guarantee.
- Free tool limitations: Free checkers cap requests, hide deeper data, or use approximate bulk results. They are suitable for triage, not final due diligence.
- Third-party layers: Some tools claim Moz-powered or Ahrefs-based results but add their own layers, so output may not match the native platform exactly.
Analysis
Best Practices for Using Domain Authority Checkers
- Pick one metric and use it consistently for trending, not cross-tool score matching.
- Compare a site against real organic competitors, not arbitrary thresholds.
- Use authority scores as a screening filter, then inspect referring domains manually.
- Treat free tools as triage, not final due diligence.
- Prefer native tools when you need the deepest backlink context.
- Do not buy links just because a domain has a high DA/DR/CF number.
See also: Backlink Monitoring and Link Building Software.
Answers
Frequently asked questions
What is the best domain authority checker?
Depends on what you need. For canonical DA, Moz. For backlink analysis, Ahrefs. For mixed signals, Semrush. For trust metrics, Majestic. The 'best' is the one that matches your workflow.
Are DA, DR, and Authority Score the same thing?
No. They are different proprietary metrics from different vendors, built from different data and formulas. Use them for relative comparison within the same system, not as direct equivalents.
Can I trust free domain authority checkers?
Yes for quick screening, but not as a final verdict. Free tools are usually limited, approximate, or layered on top of another vendor's metric, so they are best for triage and rough benchmarking.
Does a higher DA mean higher Google rankings?
No. DA is a predictive third-party metric, not a Google ranking signal. It can correlate with stronger sites, but it does not guarantee rankings.
Which tool is best for bulk checks?
Bulk-focused free tools like SEO Review Tools and DA/PA checker variants are convenient, but they trade depth for volume. For serious bulk prospecting, paid suites usually give cleaner data and workflow control.
Evidence
Sources cited
- Semrush — Free authority checker with a 1–100 scale based on combined signals.
- SEO Review Tools — Bulk comparison and competitor benchmarking, with approximate results.
- Linkody — Combines DA, TF, CF, and other metrics in one view.
- Indexed — Free DR checkers based on Ahrefs data, with bulk limits.
- Search Engine Journal — Advises consistent use of one metric for trending.
- Duda — Explains differences between DA, DR, Authority Score, and TF/CF.
- DA PA Checker — Bulk checking up to 1000 URLs with export.
- SmallSEOTools — Bulk URL checking and export.
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