The ahrefs vs semrush debate has been running for a decade. For most of that time, the comparison came down to two things: who has the better backlink index and who has the better keyword database.
Those things still matter. But in 2026, the comparison has a third dimension that most guides haven’t caught up with yet.
Both platforms now offer AI visibility tracking. Ahrefs launched Brand Radar to monitor how brands appear in LLM-generated answers. Semrush rebuilt its pricing around an SEO + AI Search tier structure that bundles AI tracking into every plan. The question isn’t whether these tools can track AI search anymore. It’s which one does it better, and for whom.
This comparison focuses on what’s actually changed. If you’re choosing between the two in 2026, the AI layer is where the decision gets interesting.
AI visibility tracking: the biggest differentiator
This is where the two platforms diverge most sharply.
Ahrefs Brand Radar is purpose-built for AI visibility. It tracks brand mentions across seven AI engines: AI Overviews, AI Mode, ChatGPT, Perplexity, Gemini, Copilot, and Grok. The database behind it runs on 271 million monthly AI prompts, which Ahrefs describes as “search-backed prompts, not synthetic ones.” That distinction matters. Search-backed prompts reflect what real users actually ask, rather than prompts generated by another model to pad coverage numbers.
Brand Radar also tracks YouTube, TikTok, and Reddit visibility (currently free while in beta), which gives it a broader view of where brands get discovered beyond traditional search and AI engines.
Semrush takes a different approach. Rather than building a standalone AI product, it integrates AI tracking directly into its SEO plans. Even the base SEO plan at $139/mo includes the ability to track performance in AI search, monitor AI sentiment, run AI visibility reports for any domain, and monitor custom prompts. The Starter plan ($199/mo) adds 50 prompts to track daily, one domain for AI brand performance monitoring, 300 AI visibility reports per day, and an AI-ready Site Audit.
The platforms also differ in which AI engines they cover. Semrush tracks Google Search, ChatGPT, Perplexity, and Gemini among others. Ahrefs covers those same engines plus Copilot and Grok, giving it slightly wider coverage at the engine level.
For teams that want AI visibility tracking as their primary use case, Ahrefs offers deeper data through a dedicated product. For teams that want AI tracking folded into a broader SEO workflow, Semrush’s integrated approach reduces tool sprawl.
Pricing compared
Pricing structures have shifted significantly as both platforms added AI capabilities.
Ahrefs offers four core plans: Lite at $129/mo (5 projects, 750 tracked keywords, 5 tracked prompts), Standard at $249/mo (20 projects, 2,000 tracked keywords, 10 tracked prompts), Advanced at $449/mo (50 projects, 5,000 tracked keywords, 20 tracked prompts), and Enterprise at $1,499/mo. Brand Radar is available as a standalone product starting from $199/mo, or you can buy custom prompt packages separately starting at $50/mo for 2,500 checks.
Semrush restructured its pricing around four SEO + AI Search tiers: SEO at $139/mo (5 websites, 500 keywords), Starter at $199/mo (50 daily prompt tracks, 300 AI visibility reports/day), Pro+ at $299/mo (100 daily prompt tracks, 1,500 keywords), and Advanced at $549/mo. Annual billing saves up to 17% on both platforms.
The pricing tells you something about each platform’s philosophy. Ahrefs treats AI visibility as a modular add-on you can buy separately or bundle with traditional SEO tools. Semrush treats it as inseparable from SEO, bundling basic AI tracking into every plan. If you only need AI visibility data and already have an SEO workflow, Ahrefs lets you buy exactly that. If you’re building both capabilities from scratch, Semrush’s bundled approach may cost less overall.
Backlink and keyword databases
The traditional comparison still carries weight because backlinks and keywords remain ranking factors in AI search. AI engines like Google’s AI Overviews use the same core search index that traditional rankings feed into. Strong domain authority and topical relevance, both built through backlinks and keyword coverage, improve your chances of being retrieved during AI answer generation.
Ahrefs publishes its index numbers openly: 18.1 billion content pages crawled, 35 trillion live backlinks tracked, 28.7 billion keywords filtered, coverage across 217 locations, and 16 years of historical data. The company describes its crawler as “the world’s second-most active” and backs it with infrastructure including 647,000 CPU cores and 495 petabytes of SSD storage.
Semrush doesn’t publish equivalent index figures on its features page, but positions itself as a broader marketing platform with toolkits spanning SEO, content, advertising, social media, local SEO, and competitive intelligence. Where Ahrefs leads with raw data scale, Semrush leads with breadth of marketing tools under one roof.
For pure backlink research, Ahrefs’ index has traditionally been considered deeper. For workflows that combine keyword research with content optimization, rank tracking, advertising analysis, and social media management, Semrush’s wider toolkit means fewer third-party tools in your stack.
AI-specific features beyond tracking
Both platforms have built AI capabilities that go beyond simple visibility monitoring.
Ahrefs includes AI Content Helper for content optimization, Bot Analytics to see which AI crawlers access your site, Custom Prompts to track specific AI queries that matter to your business, and an MCP (Model Context Protocol) server that lets AI assistants access Ahrefs data programmatically.
Semrush offers its AI PR Toolkit for getting coverage in media cited by AI engines, AI Connectors (also MCP-based), an AI-ready Site Audit that checks how well your pages are structured for AI consumption, and its publicly available AI Visibility Index that benchmarks AI visibility across industries.
One notable difference: Semrush’s AI PR Toolkit specifically targets the media citations that AI engines pull from when generating answers. This fills a gap that Ahrefs doesn’t directly address. If AI engines cite news outlets and industry publications in their answers, getting your brand mentioned in those outlets becomes a viable AI search optimization strategy.
Ahrefs’ Bot Analytics, on the other hand, gives you direct visibility into which AI crawlers are accessing your site and how often. That data feeds into AI crawler access decisions, helping you understand whether blocking or allowing specific bots affects your AI visibility.
Platform breadth vs depth
This is where personal preference and team structure drive the decision.
Semrush positions itself as an all-in-one marketing platform. Beyond SEO and AI tools, it includes advertising toolkits, social media management, content marketing tools, local SEO with six dedicated tools, competitive and market analysis, and an App Center that extends functionality through third-party integrations.
Ahrefs has expanded beyond its SEO roots with Web Analytics, Social Media Manager (in beta), and GBP Monitor (in beta) for local SEO. But its core strength remains search data. The company invested heavily in infrastructure, building its own supercomputer (Yep1, ranked in the Top 50 fastest worldwide) rather than relying on cloud providers.
For a solo SEO or small agency that lives in search data daily, Ahrefs’ depth and speed tend to feel more efficient. For marketing teams that need one platform spanning SEO, paid media, social, and content, Semrush reduces the number of subscriptions and logins.
Which should you choose
There’s no universal answer, but there are clear patterns in who benefits most from each platform.
Choose Ahrefs if:
- AI visibility tracking is your primary concern and you want the deepest dataset (271M monthly prompts across seven AI engines)
- You prioritise backlink research and need the largest live backlink index (35 trillion)
- You want modular pricing where you can buy Brand Radar separately without a full SEO suite
- Your workflow centres on search and AI data rather than broader marketing channels
Choose Semrush if:
- You want AI tracking bundled into your SEO plan without paying for a separate product
- You need a single platform covering SEO, content, advertising, social, and local
- AI PR and media coverage in AI-cited sources is part of your strategy
- You’re scaling a team that needs diverse marketing tools under one login
Both platforms now treat AI search visibility as a core feature rather than an afterthought. The real question isn’t which tool is “better.” It’s which approach, deep and modular or broad and integrated, fits how your team actually works.
If you’re still evaluating options, our guide to answer engine optimization tools covers the broader landscape beyond these two platforms.