Semrush vs Ahrefs vs Moz – Comparison

I have subscription receipts for Ahrefs, Semrush, and Moz going back to 2014. I have used each of them as my primary SEO tool for at least a year, and I have fired two of them at different points when they fell behind. Today, I keep active subscriptions to two of the three because no single platform does everything a serious PBN builder needs. If you are trying to decide where to spend your first (or next) $130 to $450 a month on an SEO toolkit, you need a comparison that cuts through the marketing claims and tells you what these tools actually do well, where they fail, and which one is the best fit for your specific workflow.

This semrush vs ahrefs comparison is written for link builders, PBN operators, and SEOs who need reliable backlink data, domain vetting metrics, and competitive intelligence. I will also address Moz, because the ahrefs vs semrush vs moz question still comes up constantly in forums, even though Moz has fallen far behind for serious link research. I will give you the real pricing, the real strengths, and the honest trade-offs. No affiliate-driven fluff.

Quick Verdict

For most PBN builders and link-focused SEOs, Ahrefs is the best all-around tool for backlink research, competitive analysis, and domain discovery. Its backlink index is the freshest and largest, its interface is fast, and its Domain Rating metric, while not a trust signal, is useful for quick benchmarking. Semrush is the better choice if you need a complete marketing suite that includes strong content, PPC, and social media tools alongside solid backlink data, though its link index is slightly less comprehensive. Moz is no longer competitive for serious link building. Its Domain Authority metric is easy to manipulate, its link index is smaller, and it lacks the depth that Ahrefs and Semrush provide. I do not recommend Moz as a primary tool for PBN builders.

But there is a critical nuance. None of these three tools provides a true trust metric for domain vetting. For that, you still need Majestic. I use Ahrefs for broad backlink analysis and Majestic for Trust Flow and Citation Flow verification. The combination of Ahrefs and Majestic is the gold standard for PBN domain evaluation. I will explain exactly where each platform fits in my daily workflow.

Pricing at a Glance

Here are the entry-level paid plans for each tool as of mid-2026.

Ahrefs and Semrush are priced almost identically at the entry level. Moz is cheaper, but you get what you pay for. The higher-tier plans from Ahrefs and Semrush scale to agency needs, while Moz's higher tiers do not add enough value to justify the cost for most link builders. I will detail the higher-tier pricing later.

Backlink Research: The Core of the Comparison

Backlink data is why most of us subscribe to these tools. I have spent thousands of hours in the backlink interfaces of all three platforms. Here is how they compare in 2026.

Ahrefs backlink index. Ahrefs has the largest and freshest backlink index of the three. New links to major sites can appear within hours. The Site Explorer interface is fast and intuitive. You can pull a complete backlink profile, filter by dofollow/nofollow, anchor text, referring domain authority, and traffic. The "New" and "Lost" backlinks charts let you monitor link acquisition and decay in real time. The "Best by Links" report shows which pages on a domain attract the most backlinks, which is gold for understanding a domain's historical niche when vetting expired domains. I detailed this process in my guide on restoring old websites from Wayback. Ahrefs also shows outbound links, letting you see if a domain links to spammy sites or link farms.

Semrush backlink index. Semrush's backlink index is good but not quite as comprehensive or fast-updating as Ahrefs. It tends to find slightly fewer referring domains for a given site, especially newer links. However, Semrush compensates with better integration of toxic link detection. Its Backlink Audit tool automatically flags potentially toxic links based on a proprietary algorithm. This is useful for quick, high-level audits, though I still prefer manual review for important decisions, as I described in my backlink audit guide. Semrush also offers a "Backlink Gap" tool that compares your profile against competitors, which is helpful for identifying untapped link sources.

Moz backlink index. Moz's Link Explorer has a smaller index and updates more slowly. It misses a significant portion of backlinks that Ahrefs and Semrush find. For PBN domain vetting, this is a dealbreaker. You cannot afford to miss toxic links or over-optimized anchors because your tool's index is incomplete. Moz also lacks the advanced filtering and reporting that Ahrefs and Semrush offer. I still see Domain Authority quoted by sellers, but as I have said repeatedly, DA is a volume metric that can be easily inflated. It does not measure trust. I explained this fully in my da vs dr vs tf comparison.

Winner for backlink research: Ahrefs, with Semrush a close second for integrated auditing.

Domain Authority vs Domain Rating vs None of the Above

Every tool has a proprietary domain-level metric. These scores are widely used and widely abused. Here is what they actually mean for link builders.

Ahrefs Domain Rating (DR). DR measures the strength of a domain's backlink profile on a 0-100 scale, based on the number and quality of referring domains. It is a useful quick benchmark. A DR 50 site is generally stronger than a DR 20 site. But DR is not a trust metric. I have seen DR 40 domains with a Trust Flow of 3 because the DR was inflated by low-quality links or a 301 redirect from a stronger domain. I discussed this manipulation in my link metrics that matter guide. Use DR for competitive comparison, not for final vetting.

Semrush Authority Score. Similar to DR, Authority Score is a compound metric based on backlink data, organic traffic, and other signals. It is also not a trust metric. It can be skewed by traffic spikes or link volume. I use it as a secondary check, similar to DR.

Moz Domain Authority (DA). DA is the most manipulated metric in the industry. I can push a domain from DA 5 to DA 30 with a few thousand automated blog comments. DA correlates poorly with actual trust and is not a reliable vetting metric. I do not use DA for any serious evaluation.

What is missing. None of these tools provide a true trust metric like Majestic's Trust Flow. Trust Flow measures the quality of a domain's backlinks based on a seed set of trusted sites. It is much harder to inflate. The TF/CF ratio is my primary gate for any domain I buy or use for a link. I explained the TF/CF ratio rule in its own guide. Ahrefs, Semrush, and Moz all lack this critical signal. This is why I always recommend pairing one of these platforms with Majestic ($49/mo Lite).

Anchor Text Analysis

All three platforms offer anchor text reports, but the depth and usability vary. Ahrefs provides a clean, detailed anchor text distribution with exact phrases and percentages. I use it to check for over-optimization on both my own sites and potential PBN domains. If a domain has a single commercial anchor on 40% of its links, it has been used for manipulation. I reject it. My anchor text data study after the March update showed that domains with clean, varied anchors are far more likely to survive.

Semrush's anchor text report is similarly detailed. Moz's is more limited. For PBN vetting, Ahrefs and Semrush are both fine. I slightly prefer Ahrefs for speed and filtering options.

Keyword Research and Organic Traffic

This is where Ahrefs and Semrush pull away from Moz entirely. Both offer powerful keyword research tools with accurate volume estimates, keyword difficulty scores, and SERP analysis. Ahrefs' Keywords Explorer is fast and provides excellent "Questions" and "Also rank for" reports, which I use to build content clusters and find featured snippet opportunities. Semrush's Keyword Magic Tool offers a massive keyword database and strong filtering, making it excellent for content planning at scale.

Both tools also estimate organic traffic for any domain or page. This is invaluable for PBN vetting. A domain with zero organic traffic is a red flag, potentially deindexed or penalized. Even a few hundred visits per month suggests the domain is alive and trusted. Moz offers traffic estimates but they are less accurate and based on a smaller data set.

For PBN builders, Ahrefs' combination of a fresh backlink index and reliable traffic estimates makes it the best single tool for domain discovery and vetting. Semrush is a very close second, especially if you value the integrated toxic link detection.

Unique Features That Matter to Link Builders

Ahrefs Brand Radar. Launched in late 2025, Brand Radar monitors unlinked brand mentions across the web. For GEO and AI visibility, unlinked mentions are as important as linked ones, as I explained in my guides on AI visibility and brand mentions and generative engine optimization. Brand Radar shows me when my brand (or a competitor's) is mentioned on a page that Ahrefs has crawled. It flags whether the mention is linked or unlinked. This is useful for identifying link reclamation opportunities. I use it alongside manual AI mention tracking, which I described in my guide on tracking AI mentions.

Semrush Media Monitoring. Semrush's equivalent tracks brand mentions across news, blogs, and social media. It is integrated with the broader Semrush toolkit, making it a good choice if you want brand monitoring and link building in one platform.

Moz. Moz does not offer a comparable brand mention tracking feature.

AI Overview tracking. Both Ahrefs and Semrush have started surfacing limited data on AI Overview citations, but neither is mature. For now, manual testing and tools like Brand24 remain the primary way to monitor AI visibility. I reviewed the AI search tools stack in its own guide.

Which Tool Is Best for Your Workflow?

I will break this down by role, because there is no single right answer.

For the dedicated PBN builder or link seller. Ahrefs is the best choice. Its backlink index is the largest and freshest, its interface is the fastest, and DR provides a useful quick benchmark. Pair it with Majestic for trust verification and Domain Hunter Gatherer for expired domain discovery, and you have a complete toolkit. I use this exact stack daily and described it in my PBN SEO tools guide.

For the agency needing an all-in-one marketing suite. Semrush is the better choice. It does not match Ahrefs' backlink freshness, but it covers PPC, social media, content marketing, and client reporting in a single platform. If you are running a full-service agency and backlink analysis is one of many tasks, Semrush's breadth is valuable.

For the budget-conscious link builder. Neither Ahrefs nor Semrush is cheap. If your budget is tight and your primary need is domain vetting, skip both and go with Majestic ($49/mo). Majestic lacks keyword research and traffic estimates, but it gives you the trust metrics that matter most for PBN domain evaluation. I explained why this is the better value path in my guide on link metrics that matter. If you can afford two tools, combine Majestic with Ahrefs Lite ($129/mo). That is the professional minimum.

For Moz users. I do not recommend Moz as a primary tool for link building in 2026. If you are already using it for other features and it meets your needs, fine. But if you are building a toolkit from scratch, put your money toward Ahrefs or Semrush. Moz has not kept pace.

A Note on Majestic

I have mentioned Majestic several times in this comparison because it fills the gap that Ahrefs, Semrush, and Moz all share: the absence of a reliable trust metric. Majestic's Trust Flow and Citation Flow are the best predictors of a domain's quality and its ability to survive algorithm updates. I use Majestic as the final gate on every domain I acquire. If a domain passes Ahrefs' DR and traffic checks but has a TF/CF ratio below 0.6, I reject it. I have written a full guide on the TF/CF ratio rule. At BuyPBNLinks, every domain in our inventory is vetted through Majestic. If you are buying links, ask your seller for Trust Flow, not just DR or DA.

Detailed Feature Comparison Table

How I Use These Tools at BuyPBNLinks

At our service, we maintain subscriptions to both Ahrefs and Majestic. The combination costs us about $178/mo (Ahrefs Lite and Majestic Lite). We use Ahrefs for discovering new link opportunities, auditing client backlink profiles, tracking rankings, and monitoring our network's health. We use Majestic for the trust verification that Ahrefs lacks. Every PBN domain we acquire passes both Ahrefs' basic health check (indexed, traffic, DR) and Majestic's trust check (TF/CF ratio above 0.8). We do not use Moz. We occasionally use Semrush for client reporting and content research, but it is not part of our core link building stack.

For clients who buy links from us, you benefit from this dual-tool vetting without needing to subscribe yourself. We handle the domain evaluation, the hosting audits, and the ongoing monitoring. If you prefer to build your own network, I strongly recommend subscribing to Ahrefs Lite and Majestic Lite as your minimum viable tool stack.

Frequently Asked Questions