Ahrefs DR (Domain Rating) and DA (Domain Authority, from Moz) are distinct authority metrics that serve different SEO strategies. DR measures link-based domain strength on a 0–100 scale using Ahrefs' proprietary algorithm; DA does the same for Moz users. Neither is objectively "better"—they measure similar concepts with different datasets. DR tends to correlate more closely with rankings for newer domains, while DA has broader historical adoption in the industry.
What is Ahrefs Domain Rating (DR)?
Ahrefs DR is a link-strength score from 0–100 that estimates how authoritative a domain is based on its backlink profile. It considers link volume, referring domain diversity, and quality signals in Ahrefs' index (which crawls ~400 billion+ backlinks). A domain with DR 60 has meaningfully stronger link authority than one at DR 20.
How DR is calculated: - Link count from unique referring domains - Authority of those linking domains (recursive calculation) - Diversity and recency of backlinks - Quality filters applied to spam or low-quality links
DR is exclusive to Ahrefs and powers many of their tools: Site Explorer, Rank Tracker, and Content Explorer all surface domain ratings.
What is Domain Authority (DA)?
Domain Authority, created by Moz in 2010, uses a similar logic to DR but relies on Moz's own link index. DA also ranges from 0–100 and predicts a domain's likelihood to rank in search results. Moz updates its link data less frequently than Ahrefs (roughly monthly), which can make DA feel slightly lagged for real-time analysis.
Key DA characteristics: - Calculated on a logarithmic scale (harder to gain points at higher DA levels) - Updated monthly, not in real-time - Available in Moz Pro, Free Tools, and third-party integrations - Uses Page Authority (PA) as a companion metric for individual pages
DR vs. DA: Side-by-Side Comparison
| Aspect | Ahrefs DR | Moz DA |
|---|---|---|
| Update frequency | Real-time / daily | Monthly |
| Link index size | ~400B+ backlinks | ~40B+ backlinks |
| Scale | Linear (0–100) | Logarithmic (0–100) |
| Best for | Competitive link analysis; rank tracking | Historical trend tracking; beginner SEO |
| Tool ecosystem | Rank Tracker, Site Explorer, Content Explorer | SEO Toolbar, API, Moz Pro |
| Cost | Paid subscription (no free CR equivalent) | Freemium (limited free version) |
| Standout feature | Integrated with Rank Tracker for traffic correlation | Long-term domain authority history |
Why the Difference? Crawl Data and Algorithms
Both metrics rely on backlink data, but they index and weight links differently:
- Crawl scope: Ahrefs crawls the web more aggressively and frequently, catching new backlinks faster. Moz's monthly crawl cycle means fresh links take 30+ days to impact DA.
- Link weighting: DR places heavier emphasis on referring domain quality (are the linking domains themselves authoritative?). DA uses a similar approach but with different spam thresholds.
- Recency bias: DR adjusts more quickly when a domain gains or loses high-quality backlinks. DA's logarithmic scale means change is gradual.
Neither metric directly ranks pages—Google uses its own proprietary systems (PageRank, E-E-A-T signals, content relevance). DR and DA are *proxies* for authority that correlate with rankings but don't cause them.
How to Check DR and DA for Any Domain
To view Ahrefs DR: - Use Ahrefs Site Explorer (requires paid account; no free trial without credit card for the full platform) - Install Ahrefs Free Browser Extension (shows DR/UR for any page you visit) - Check SEMrush, Ubersuggest, or other third-party tools that license Ahrefs data
To view Moz DA: - Moz's free tools (seomoz.org/tools) let you check DA instantly - Moz Toolbar browser extension shows DA/PA in real-time - Paid Moz Pro subscribers get deeper reporting and API access
DR vs. DA: Limitations and Reality Checks
Both metrics have blind spots:
- They don't measure on-page relevance. A high-DR domain with spammy, irrelevant content won't rank for your target keywords.
- They lag real ranking factors. Google's algorithms incorporate freshness, user intent match, and topical expertise—neither DR nor DA captures these fully.
- They assume all links are comparable. A link from Forbes (very high DR) and a link from a low-quality directory are weighted differently, but DR/DA algorithms still simplify the real ranking picture.
Many SEOs use DR and DA as *screening tools* (e.g., "we only pursue backlinks from domains with DR >30") rather than predictors of success.
Ahrefs Free Trial and Access Options
If you want to test DR and explore Ahrefs without a paid subscription:
- Free Browser Extension: Ahrefs' free extension shows DR, backlink count, and organic traffic estimates on any page.
- Backlink Checker (limited): Ahrefs Backlink Checker offers free checks on a handful of domains per month.
- Limited free trial: Ahrefs occasionally offers credit-card-free trials; check their signup page for current promotions.
- Student/nonprofit discounts: Ahrefs offers reduced pricing for students and nonprofits.
For a full Rank Tracker or Site Explorer trial, expect to provide a payment method (standard industry practice).
Programs and Tools Like Ahrefs
If Ahrefs' pricing is out of reach, here are comparable alternatives:
- SEMrush: Full-stack SEO platform with domain authority insights, Rank Tracker, and Content Marketing Platform. Integrates Google Search Console data more seamlessly than Ahrefs.
- Ubersuggest: Budget-friendly backlink and keyword tool with domain authority scores and rank tracking.
- Moz Pro: Own Domain Authority metric, keyword research, and site audit tools.
- Google Search Console (free): Shows your own domain's clicks, impressions, and ranking position—doesn't rank external domains but is the ground truth for your traffic.
For prioritizing what to fix on your own site, SEOcompass integrates Google Search Console directly, surfacing the highest-impact backlink and on-page fixes correlated with actual search traffic. Unlike tools that rank by DR alone, SEOcompass weights changes by traffic upside and winnability—helping you focus on fixes that move traffic, not vanity metrics.
When to Use DR vs. DA in Practice
- Use DR if you have an Ahrefs subscription and need real-time backlink updates or competitive link analysis.
- Use DA if you prefer a free or low-cost option and don't need daily updates.
- Use both if you want to triangulate authority across datasets (a domain with high DR and low DA might be building links in a narrow niche).
- Use neither as your primary KPI. Google Search Console traffic is the ultimate source of truth for whether your SEO strategy works.
Key Takeaways
- DR and DA measure similar concepts (link-based domain authority) with different indexes and algorithms.
- DR updates faster; DA is free or low-cost and has broader adoption.
- Neither predicts rankings directly—they're correlation proxies, not causation.
- Use them to screen potential link partners or understand competitive landscapes, not to justify strategy alone.
If you want to optimize your site for both Google and AI answer engines (which increasingly cite authoritative domains), starting with Google Search Console to identify high-impact fixes is more effective than chasing DR or DA scores. Try SEOcompass free to see the highest-traffic opportunities on your domain ranked by effort and likelihood to move the needle.