HEAD TO HEAD
Ahrefs vs SEMrush: could you build either?
You are not rebuilding either of these, and the reason is identical: both sit on a proprietary web-scale crawl index that costs millions a year to run. The only real decision here is which subscription.
Side by side
| Ahrefs | SEMrush | |
|---|---|---|
| verdict | Just pay | Just pay |
| vibe score | 56/100 | 69/100 |
| time to code | not worth starting | not worth starting |
| their price | $129/mo | $139.95/mo |
| per year | $1548/yr | $1679/yr |
| agent cost to build | $86–$172 | $86–$172 |
| hosting after | $0/mo | $0/mo |
| category | seo | seo |
| last checked | 2026-08 | 2026-08 |
These land in the same place — both worth paying for. Neither is a rebuild worth starting. SEMrush lists at $139.95/mo against $129/mo for Ahrefs, a difference of $131 a year.
Why Ahrefs gets Just pay
- Checking a specific page's backlinks via an existing SEO API is a bounded integration
- A dashboard of your own site's tracked metrics over time is standard charting
- For narrow, single-site monitoring, a lighter tool covers real needs
Why SEMrush gets Just pay
- Tracking your own site's ranking for a specific keyword (via a search API) is a bounded, achievable feature
- A dashboard showing rank changes over time for a tracked keyword list is ordinary charting
- For monitoring a handful of your own keywords, a much narrower tool is genuinely sufficient
Where the builds overlap
Both rebuilds are made of parts from the Vibe Codeability Database. The shared ones are work you'd do once either way — the split ones are what actually separates these two.
SHARED — 2 parts
| Landing page | 99 |
| Proprietary web-scale index | 12 |
ONLY AHREFS
Nothing — every part of this rebuild is also in SEMrush.
ONLY SEMRUSH
- CRUD database 95
What you lose leaving Ahrefs
- The backlink index itself — crawling and re-crawling billions of pages to find who links to whom — is server farm-scale infrastructure, not weekend engineering
- Keeping that index fresh (re-crawling as pages change) is an ongoing operational cost, not a one-time build
- Content-gap and keyword-difficulty scoring is built on top of that same proprietary crawl data
What you lose leaving SEMrush
- Their competitive keyword and backlink database comes from crawling and indexing a meaningful fraction of the web, continuously — not something one build replicates
- Search-volume estimates require aggregated query data at a scale only a few companies have access to
- The site-audit crawler that flags technical SEO issues across thousands of pages is real, ongoing crawler engineering
Read the full verdicts
Questions
Is Ahrefs or SEMrush easier to build yourself?
These land in the same place — both worth paying for. Neither is a rebuild worth starting. SEMrush lists at $139.95/mo against $129/mo for Ahrefs, a difference of $131 a year.
Can I build Ahrefs?
Just pay. Ahrefs' entire value is its backlink index — a continuously crawled map of links across the web, refreshed on a schedule most companies can't match. There's no personal-scale version of 'crawl a meaningful fraction of the internet.'
Can I build SEMrush?
Just pay. The dashboard around SEO data — keyword lists, position tracking, a UI — is buildable. The actual product is a continuously updated index of billions of keywords and search results, crawled and refreshed at a scale no solo build gets near.
What do Ahrefs and SEMrush have in common technically?
Both rebuilds need landing page, proprietary web-scale index. That shared foundation is why they score similarly on the parts they overlap on — the difference comes from what each one adds on top.
Other comparisons
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