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Semrush Site Audit vs Ahrefs Free: catalog facts
Semrush Site Audit	Ahrefs Free
Freemium A limited free crawl is available; larger audits require a paid Semrush plan.	Freemium Free for verified websites; paid Ahrefs plans add more tools and data.
Web	Web, Browser extension
Issues ranked by severity with fix suggestions Covers AI search visibility as well as classic SEO	Technical site audit at no cost Backlink and keyword ranking data from Ahrefs' index
The free crawl is limited Full use requires a paid Semrush subscription	Requires an account and site ownership verification Full data for other people's sites needs a paid plan
Web application	Web application, Browser extension
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.