Ahrefs vs Semrush
The two most comprehensive SEO platforms. Ahrefs leads on backlink data; Semrush leads on breadth. The right choice depends on your primary use case.
Head-to-Head Scorecard
| Feature | Ahrefs | Semrush | Winner |
|---|---|---|---|
| Stack Score | 94 | 92 | Ahrefs |
| Backlink index size | 35T+ links | 43T+ links | Semrush |
| Backlink data freshness | Every 15–30 min | Every 24 hours | Ahrefs |
| Keyword database | 20B+ keywords | 25B+ keywords | Semrush |
| Site audit | Excellent | Excellent | Tie |
| Rank tracking | Yes | Yes | Tie |
| Content marketing tools | Good | Excellent | Semrush |
| PPC/Ads research | Limited | Excellent | Semrush |
| Local SEO | No | Yes | Semrush |
| Social media tools | No | Yes | Semrush |
| G2 Rating | 4.6/5 | 4.5/5 | Ahrefs |
| Starting price | $99/mo | $119.95/mo | Ahrefs |
| Free plan | Webmaster Tools | Limited trial | Ahrefs |
Sources: G2 SEO Software Reviews (aggregated Q1 2026), Ahrefs and Semrush published index statistics (April 2026).
Backlink Analysis: Ahrefs' Core Strength
Ahrefs built its reputation on backlink analysis, and it remains the industry standard for this use case. While Semrush has a larger raw backlink index (43T+ vs 35T+ links), Ahrefs updates its backlink data every 15–30 minutes vs Semrush's 24-hour refresh cycle. For link building campaigns and competitive analysis, Ahrefs' fresher data is a meaningful advantage.
Ahrefs' Domain Rating (DR) and URL Rating (UR) metrics are the most widely cited link authority metrics in the SEO industry, used by agencies and in-house teams as the standard reference for evaluating link quality.
Breadth: Semrush's All-in-One Advantage
Semrush is a more comprehensive marketing platform. Beyond SEO, it includes PPC research tools, social media management, content marketing tools, local SEO features, and a brand monitoring suite. For marketing teams that need a single platform covering multiple channels, Semrush's breadth is a genuine advantage.
Ahrefs is more focused — it does SEO exceptionally well and does not try to be everything else. For SEO specialists and content teams whose primary need is organic search, Ahrefs' focused approach means a cleaner, faster interface.
The Verdict
- Backlink analysis is your primary use case
- You are a blogger, content creator, or SEO specialist
- You want the freshest link data available
- You prefer a focused, fast interface over all-in-one breadth
- You need PPC and paid search research tools
- You manage social media alongside SEO
- You need local SEO features
- You want a single platform for all digital marketing channels