Ahrefs and Semrush are two of the most established paid SEO platforms, each offering overlapping but differently structured toolsets for keyword research, backlink analysis, and site auditing. This comparison lays out the factual differences in pricing and features — there is no single “best” SEO tool for every use case.
See how other SEO platforms compare in our Web Tools hub.
Quick Comparison
| Ahrefs | Semrush | |
|---|---|---|
| Free plan | Limited free tier (Ahrefs Free) plus a $29/month Starter plan | No permanent free plan; 7-day free trial only |
| Entry main plan | Lite: $129/month | SEO plan: $139/month ($117.33/month billed annually) |
| Known strength | Backlink index size and Site Explorer depth | All-in-one feature breadth, including AI search visibility tracking |
| Enterprise tier | $1,499/month, annual commitment required | Advanced plan at $549/month ($455.67/month billed annually) |
Pricing
Ahrefs offers a limited free tier and a low-cost $29/month Starter plan, with its main plans ranging from $129/month (Lite) to $449/month (Advanced), plus a $1,499/month Enterprise tier requiring an annual commitment. See the full breakdown on the Ahrefs profile.
Semrush does not offer a permanent free plan, only a 7-day free trial. Its plans range from $139/month (SEO) to $549/month (Advanced), with discounts of up to 17% for annual billing. See the full breakdown on the Semrush profile.
Key Differences
- Ahrefs offers a limited permanent free tier; Semrush offers only a 7-day trial.
- Ahrefs is generally recognized for the size and freshness of its backlink index.
- Semrush has expanded further into AI search visibility and brand-performance tracking.
- Both platforms’ entry-level paid plans are similarly priced, though feature allocations differ.
Who Each Tool Is Best For
Ahrefs tends to suit users who prioritize backlink research and technical site audits. Semrush tends to suit users who want a broader all-in-one platform that also covers AI search visibility and content optimization alongside traditional SEO.
FAQ
Does either tool have a free plan?
Ahrefs offers a limited permanent free tier (Ahrefs Free) plus a low-cost Starter plan. Semrush offers only a 7-day free trial with no permanent free tier.
Which is cheaper?
At the entry paid tier, Ahrefs’ Lite plan ($129/month) is slightly cheaper than Semrush’s SEO plan ($139/month), based on current published pricing.
Which has a bigger backlink database?
Ahrefs is widely recognized in the SEO industry for the size and update frequency of its backlink index, though both platforms maintain large, regularly updated databases.
Are there other SEO tool alternatives?
This site currently profiles Ahrefs and Semrush. Other well-known SEO platforms are not yet covered here.