Domain Rating vs. Domain AuthorityWhat Is the Difference, and Which One Should You Actually Track?

Picture this. You run the same website through two different SEO tools. Moz tells you the domain authority is 41. Ahrefs tells you the domain rating is 57. A competitor shows up as DA 38 in one report and DR 61 in another. Nobody mentioned this would happen. Nobody explained why.

The first instinct is usually to wonder which tool is broken. The answer is neither. What you are looking at is two separate companies, running two separate web crawls, applying two separate algorithms to the same underlying question, and arriving at two genuinely different answers. Not because one is right and one is wrong, but because they are measuring the same concept using different data and different logic.

This article walks through exactly why the gap exists, what each score is really built on, and most usefully, how to decide which one belongs in your reporting. By the end, the confusion will not just be resolved. It will make complete sense.

Two Scores, One Origin Story

To understand why DA and DR exist, you need to know what came before them. For years, Google published a metric called PageRank, a publicly visible score that gave SEOs a rough sense of how Google valued any given website. It was imperfect, easy to manipulate, and never the whole picture. But it was official. It was comparable. And when Google quietly retired the public version in 2016, it left a gap that the SEO industry immediately started filling.

Moz had already been building its own version of that kind of signal for years. Domain Authority was their answer: a proprietary score on a scale of 1 to 100, calculated from Moz’s own web crawl data, designed to estimate how well a domain would perform in search based on the strength of its external links.

Ahrefs had been building something similar in parallel. They called it Domain Rating, also 1 to 100, also built on their own crawl data, also measuring the quality and quantity of external links pointing to a domain.

Strip away the branding, and both scores are solving the same problem: in the absence of an official authority signal from Google, what is the best independent estimate of a website’s link profile strength? The difference between them is not in question. It is in how each company went about answering it.

Why the Same Website Gets Two Different Numbers

This is the question that brings most people to this article, so it deserves a thorough answer. There are three separate reasons why DA and DR diverge for the same site, and understanding each one makes the gap feel far less mysterious.

They are reading from different books

Moz and Ahrefs each crawl the web independently. They do not share data, they do not cross-reference results, and they have each discovered a different collection of the links that exist across the internet.

Think of it like two researchers asked to catalogue every book in a vast library, starting from different sections, moving at different speeds, and finishing with different but overlapping lists.

Ahrefs is widely regarded as maintaining one of the largest and most frequently refreshed link indexes in the industry. That means it tends to discover more links, and more links from credible sources mean a higher score. This is the single most common reason a site’s DR is higher than its DA.

They do different things with what they find

Even where both tools have indexed the same links, the algorithms that convert those links into a score take different routes. Moz uses a machine learning model specifically trained against Google search performance data, the logic being that if the goal is to approximate Google’s view of authority, you should train on Google’s actual outputs.

Ahrefs uses a flow-based recursive model where a site’s DR depends partly on the DR of the domains linking to it, a method that spreads authority through the link graph rather than calibrating against search data. Neither approach is objectively superior. They are different philosophical choices about what “authority” means.

They update on different schedules

Both tools refresh their scores regularly, but the timing does not align. A Moz index update might recalibrate scores downward across the board as its crawl expands. An Ahrefs recrawl might surface a batch of newly discovered links that push DR up.

These cycles run independently, which means two readings taken on the same day from different tools may reflect very different moments in each platform’s data cycle.

A gap between DA and DR is not a sign that something is wrong. It is a sign that two companies looked at the same website through two different lenses and saw two slightly different things.

The Scale Trap: Why High Scores Diverge More

Both DA and DR use logarithmic scales, but they compress their data differently. This creates a pattern worth understanding before you start comparing scores across tools: the higher the score, the bigger the apparent gap tends to be between DA and DR for the same site.

At the lower end, the difference is usually modest. A site might show DA 22 and DR 27, a small gap that is easy to attribute to index differences and move on from. But at the higher end, the same site might show DA 54 and DR 71. That gap looks significant. It can feel like one tool is dramatically overvaluing or undervaluing the site. In reality, the divergence is partly a mathematical artifact of two logarithmic scales compressing data differently at higher values.

The practical consequence is straightforward. If you are comparing your score against a competitor and you are both in the mid-to-high range, a cross-tool comparison will exaggerate the gap between you in ways that are not meaningful. A competitor’s Ahrefs DR compared to your Moz DA is not a fair fight, even if the metric names sound equivalent.

DA vs. DR Side by Side

Rather than carrying the comparison across several more paragraphs, the table below lays the key dimensions out cleanly. Use it as a reference point when you need to explain the difference to a colleague or a client who has spotted two different numbers and wants to know which one to trust.

The most important row in that table is the last one. DA is the metric most commonly used in agency reporting and the one non-technical stakeholders are most likely to have encountered already. DR tends to be the metric of choice for technical SEOs and in-house teams working directly inside Ahrefs. Neither is more correct. Both are measuring the same underlying thing in different ways.

Do Either of Them Predict Google Rankings?

This is the question sitting underneath every DA versus DR debate. If one score correlates more reliably with actual Google rankings, it would be the obvious choice.

The honest answer is that neither score is a reliable predictor of rankings at the keyword level. Both have been tested against large Google search data sets by the platforms themselves and by independent researchers. Both show a moderate positive correlation; higher scores do tend to appear more often in competitive search results.

But the correlation weakens sharply when you zoom into specific keywords, where content relevance, search intent alignment, on-page quality, and technical performance account for far more of the ranking variance than authority score captures.

A site with DA 70 can rank below a site with DA 35 on a keyword that the lower-authority site has addressed more thoroughly and relevantly. This happens regularly, and it is not an anomaly; it is exactly what you would expect from a metric that measures one signal among dozens. Both scores are directionally useful. Neither is a ranking oracle.

Which One Should You Actually Track?

Here is the practical answer most comparison articles avoid giving: it does not matter which one you pick. What matters enormously is that you pick one and use it consistently. The majority of confusion around DA and DR does not come from either tool being unreliable — it comes from the habit of mixing scores from different platforms in the same reporting line, often without realising it.

If your team or agency is already working inside Moz, track DA. If your team runs primarily on Ahrefs, track DR. If you are starting fresh with no existing tool preference, Ahrefs’ larger link index makes DR slightly more sensitive to smaller changes in link profile strength over time, which can be an advantage when monitoring progress on a newer or lower-authority domain.

Whatever you choose, apply it to your own site and your direct competitors every month, at the same time, using the same tool. The six-to twelve-month trend line that emerges from that practice is worth far more than any individual score reading. And a rising trend on either metric, measured consistently, is a meaningful signal that your link-building effort is working, regardless of which company’s algorithm produced the number.

The Takeaway

Domain rating and domain authority are not competing answers to the same question. They are two independent companies’ attempts to estimate the same underlying signal, external link profile strength, using data they each gathered separately and algorithms they each built independently.

The gap between them is a feature of how they work, not a flaw in either tool.

The comparison between DA and DR only becomes meaningful when you use them interchangeably in the same analysis. The moment you compare your Moz DA against a competitor’s Ahrefs DR, you are no longer comparing authority; you are comparing methodologies. The result will mislead you every time.

Choose the tool your team already works in. Apply it consistently. Use the trend it produces as a measure of your link-building progress over time. And remember that the score, whatever its source, is a reflection of the work you do to earn credible, relevant links, not a target to manage for its own sake.

FAQ

Is Domain Rating the Same as Domain Authority?

No, Domain Rating (DR) and Domain Authority (DA) are different metrics created by different SEO companies. Domain Authority is a score developed by Moz, while Domain Rating is a metric created by Ahrefs. Both measure the strength of a website’s backlink profile, but they use different algorithms and scoring systems.

Should I Focus on DA or DR?

Both metrics are useful for evaluating a website’s authority and backlink strength. Domain Authority from Moz and Domain Rating from Ahrefs provide similar insights, so many SEO professionals look at both. Instead of focusing on just one metric, it’s better to monitor overall SEO performance, backlink quality, and rankings on Google.

What Is Domain Rating?

Domain Rating (DR) is an SEO metric developed by Ahrefs that measures the strength of a website’s backlink profile. It uses a scale from 0 to 100, with higher scores indicating stronger backlinks from authoritative websites.

What Is the Difference Between DA and PA?

Domain Authority (DA) measures the ranking potential of an entire domain, while Page Authority (PA) measures the ranking strength of a specific page on a website. Both metrics are developed by Moz and use a scale from 1 to 100. DA focuses on the overall website, while PA evaluates the likelihood of an individual page ranking in search results.