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Semrush Site Audit vs Checkbot: catalog facts
Semrush Site Audit	Checkbot
Freemium A limited free crawl is available; larger audits require a paid Semrush plan.	Freemium Free to install, with Checkbot Pro from $10 per month.
Web	Browser extension
Issues ranked by severity with fix suggestions Covers AI search visibility as well as classic SEO	Crawls hundreds of pages at once More than 50 SEO, speed and security checks
The free crawl is limited Full use requires a paid Semrush subscription	Chrome only Some features require a paid plan
Web application	Browser extension
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
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.