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SEOnaut vs Semrush Site Audit: catalog facts
SEOnaut	Semrush Site Audit
Free Free and open source with no paid tier.	Freemium A limited free crawl is available; larger audits require a paid Semrush plan.
Web, Self-hosted	Web
Self-hosted, so crawl data stays on your server Docker Compose setup	Issues ranked by severity with fix suggestions Covers AI search visibility as well as classic SEO
Focused on technical audits, with no keyword or backlink data Requires running and maintaining your own server	The free crawl is limited Full use requires a paid Semrush subscription
Self-hosted	Web application
Open source	Closed source
License: MIT	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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