Ahrefs vs Moz: Which Domain Authority Score Should You Trust?
Ahrefs and Moz measure domain authority differently, and neither score is objectively correct. Ahrefs Domain Rating (DR) and Moz Domain Authority (DA) are proprietary metrics built on different link indexes, different crawl frequencies, and different scoring algorithms. They often disagree significantly on the same domain, which means treating either number as ground truth will lead you astray.
The more useful question is not which tool is more accurate, but what each metric is actually measuring, where each one is more reliable, and how to use them without over-indexing on a single number.
Key Takeaways
- Ahrefs DR and Moz DA are both proxies for link-based authority, not absolute measures of domain strength. They use different indexes and will often produce different scores for the same site.
- Ahrefs tends to have a larger, more frequently updated backlink index, which generally makes its link data more current for competitive research.
- Moz DA has broader name recognition in the industry, which matters when reporting to clients or stakeholders who already use it as a benchmark.
- Discrepancies between the two scores are normal and expected. When they diverge significantly, investigate the backlink profiles rather than assuming one tool is wrong.
- Neither score correlates cleanly with Google rankings. Use them directionally for competitive benchmarking, not as ranking predictors.
In This Article
- What Are Ahrefs DR and Moz DA Actually Measuring?
- Where Ahrefs Has the Edge
- Where Moz Has the Edge
- Why the Scores Diverge and What to Do When They Do
- How to Use Domain Authority Scores Without Over-Relying on Them
- The Crawlability Factor
- Domain Authority in the Context of a Broader SEO Strategy
- The Practical Verdict
I spent years running agency teams where we had to make fast calls on which domains were worth pursuing for links, which competitor sites were genuinely authoritative, and which ones just looked the part. Domain authority scores were part of that conversation every week. What I learned is that the score matters less than understanding what the score is built on, and both Ahrefs and Moz have real strengths worth knowing.
What Are Ahrefs DR and Moz DA Actually Measuring?
Both metrics are trying to answer the same question: how authoritative is this domain based on its backlink profile? But they get there differently.
Ahrefs Domain Rating measures the strength of a domain’s backlink profile on a logarithmic scale from 0 to 100. It accounts for the number of unique referring domains, the DR of those domains, and how many other sites each linking domain points to. A link from a domain that links to thousands of other sites carries less weight than one from a domain with a tighter outbound link profile. The score is relative to all other sites in the Ahrefs index, which means it shifts as the index grows and as other sites gain or lose links.
Moz Domain Authority uses a machine learning model trained to correlate with Google search rankings. It factors in linking root domains, MozRank, MozTrust, and other signals. Like DR, it runs on a logarithmic 0-100 scale. Moz has updated the DA algorithm several times over the years, which is part of why you sometimes see scores shift significantly without any change in the actual link profile.
If you want to understand how these two scores relate to each other in practice, the detailed breakdown at How Does Ahrefs DR Compare to DA is worth reading before you start using either metric for competitive analysis.
The short version: they are correlated but not interchangeable. A site with DR 60 and DA 40 is not necessarily stronger or weaker than a site with DR 40 and DA 60. It depends on what each tool is picking up in its index.
Where Ahrefs Has the Edge
Ahrefs has built one of the largest third-party backlink indexes available. Their crawler runs continuously, and they are generally faster at picking up new links and removing dead ones. For competitive link research, this matters. If you are trying to understand which sites are actively building links right now, Ahrefs data tends to be more current.
When I was growing an agency from around 20 people to over 100, we were pitching clients in competitive verticals where backlink velocity was a real differentiator. Ahrefs was the tool we trusted most for understanding who was moving quickly in a space and where their links were coming from. The freshness of the index made a practical difference when we were building outreach lists or auditing a competitor’s recent activity.
Ahrefs also tends to surface more granular data around anchor text distribution, link growth over time, and referring domain quality. For anyone doing serious link building or running a technical link audit, the depth of Ahrefs data is hard to match.
This is also relevant when you are evaluating niche tools. If you have looked at Long Tail Pro vs Ahrefs, you will have noticed that Ahrefs consistently wins on backlink data depth, even when Long Tail Pro has advantages for certain keyword workflows.
Where Moz Has the Edge
Moz DA has been around longer and has more widespread adoption, particularly among clients and stakeholders who are not deep in SEO tooling. If you are presenting link building results to a marketing director who has heard of DA but not DR, that familiarity has real practical value. Reporting in a metric your audience understands removes friction from the conversation.
Moz also has useful features around spam score and link quality flagging that can be helpful when you are auditing a site’s profile for toxic links. Their interface is generally more accessible for users who are not full-time SEOs, which matters if you are running a lean in-house team or working with clients who want to check their own metrics without needing a tutorial.
For B2B marketers in particular, DA is often the number that appears in briefs, proposals, and reporting decks. Moz has written thoughtfully about adapting B2B SEO strategy in ways that reflect how DA fits into broader measurement conversations. When a metric has that level of institutional familiarity, switching to a different number requires explanation every time, which adds overhead.
Why the Scores Diverge and What to Do When They Do
The most common reason for significant divergence between DR and DA is index coverage. If Ahrefs has crawled more of a domain’s backlink profile than Moz, DR will tend to be higher. If Moz’s algorithm places more weight on the quality of a smaller set of links, DA might hold up better for sites with fewer but stronger referring domains.
There is a broader lesson here that I keep coming back to. Early in my career I trusted analytics numbers more literally than I should have. Over time, working across GA, Adobe Analytics, Search Console, and a range of SEO tools, I came to understand that every platform is giving you a perspective on reality, not reality itself. Bot traffic, crawl gaps, implementation quirks, referrer loss, classification differences: all of these distort the numbers before they reach you. The job is to read the direction and magnitude, not to treat any single figure as definitive.
When DR and DA diverge significantly for a domain you are evaluating, the right response is to look at the actual backlink data in both tools. Pull the referring domains list, look at the quality and relevance of the links, check for signs of link schemes or unnatural patterns, and form your own view. The score is the starting point for investigation, not the conclusion.
This matters for more than just link prospecting. If you are evaluating a platform for SEO purposes, say assessing whether Squarespace is bad for SEO, you will find that domain authority scores tell you almost nothing about technical SEO capability. The metrics are measuring link profiles, not crawlability, indexation, or site architecture. Conflating them leads to bad decisions.
How to Use Domain Authority Scores Without Over-Relying on Them
The most practical way to use DR and DA is as a relative benchmark within a specific competitive set, not as an absolute measure of SEO strength. Compare a target domain against its direct competitors in the same niche. Look for meaningful gaps. Identify sites that are ranking well despite lower scores, which often signals strong on-page relevance or topical authority that the link-based metrics are not capturing.
When I walked into a CEO role at an agency that was haemorrhaging money, the first thing I did was get into the numbers properly. Not the headline figures, but the underlying data, the P&L line by line, the client-level margins, the cost structure. I told the board the business would lose around £1 million that year. That is almost exactly what happened. The point is not that I was clever. The point is that surface-level numbers rarely tell you what you need to know. You have to get underneath them. Domain authority scores are the same. The number on the screen is the starting point, not the answer.
For link prospecting, a reasonable approach is to use Ahrefs DR as your primary filter when you need current, granular link data, and to use Moz DA when you are communicating with stakeholders who use it as their reference point. Running both in parallel is not wasteful if you are making significant decisions around link acquisition or competitive positioning.
One area where domain authority scores are genuinely useful is in evaluating link targets for branded keyword campaigns. When you are building authority around specific branded terms, the quality and authority of the sites linking to you matters. The guidance on targeting branded keywords covers how link authority intersects with branded search strategy in ways that make the DR and DA conversation more concrete.
The Crawlability Factor
One thing that does not get enough attention in the Ahrefs versus Moz comparison is how crawl coverage affects the scores you see. Moz has written clearly about the fundamentals of crawling and why crawl depth and frequency matter for understanding a site’s link profile. If a tool’s crawler has not reached a significant portion of a domain’s backlinks, the authority score will be understated.
This is particularly relevant for newer sites or sites that have grown their link profiles rapidly. Ahrefs tends to pick up these changes faster. For established sites with stable link profiles, the gap between the two tools narrows considerably.
It is also worth noting that neither tool has complete visibility into the web. Google’s own link graph is vastly larger than anything a third-party tool can replicate. This is why neither DR nor DA should be used as a proxy for how Google views a domain’s authority. They are useful approximations for competitive benchmarking, not mirrors of Google’s internal signals.
Domain Authority in the Context of a Broader SEO Strategy
Domain authority metrics are one input into a broader SEO picture. They say something useful about the relative link strength of a domain, but they say nothing about content quality, topical relevance, technical health, or how a site handles emerging areas like answer engine optimisation. The conversation around knowledge graphs and AEO is a good example of where link authority metrics have limited predictive value. A site can have strong DR and DA and still be invisible in AI-generated answers if it lacks the structured data and topical depth those systems reward.
The agencies and in-house teams that use these metrics well treat them as one signal among many. They are not optimising for DA or DR as a goal. They are using them to understand the competitive landscape, identify link opportunities, and track relative progress over time.
If you are building an SEO practice from scratch, whether in-house or as a consultant, the question of which authority metric to report on is less important than building the right measurement habits overall. The approach to winning SEO clients without cold calling touches on this: demonstrating clear thinking about what metrics actually mean tends to be more persuasive than presenting impressive-looking numbers that you cannot explain.
If you want to see how domain authority fits into a complete SEO measurement framework, the Complete SEO Strategy hub covers the full picture, from technical foundations through to link acquisition and competitive tracking.
The Practical Verdict
For most SEO practitioners, Ahrefs DR is more useful for day-to-day competitive research and link prospecting because the index is larger and more current. For client-facing reporting and stakeholder communication, Moz DA often has the advantage of familiarity. Neither is categorically more accurate because they are measuring slightly different things with different data.
The mistake is treating either score as a precise, objective measure of domain strength. They are useful directional signals. A site with DR 70 is almost certainly stronger from a link perspective than one with DR 20, all else being equal. But the difference between DR 48 and DR 52 is not meaningful, and a site with DA 35 and excellent topical authority in a niche can outperform a DA 60 generalist site for the queries that matter.
Use both tools where you have access to both. Cross-reference when the scores diverge significantly. And keep the broader SEO picture in view, because domain authority is one input, not the whole answer.
For a fuller view of how link metrics sit within a complete SEO approach, including keyword strategy, technical auditing, and content architecture, the Complete SEO Strategy section covers the frameworks worth building around.
About the Author
Keith Lacy is a marketing strategist and former agency CEO with 20+ years of experience across agency leadership, performance marketing, and commercial strategy. He writes The Marketing Juice to cut through the noise and share what works.
