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Screaming Frog SEO Spider vs SEOnaut: catalog facts
Screaming Frog SEO Spider	SEOnaut
Freemium Free for crawls up to 500 URLs; a licence costs £199 per year.	Free Free and open source with no paid tier.
Windows, macOS, Linux	Web, Self-hosted
Runs locally as a desktop app on all three major systems Checks over 300 issues including redirects and duplicates	Self-hosted, so crawl data stays on your server Docker Compose setup
Free version limited to 500 URLs Advanced features need a paid yearly licence	Focused on technical audits, with no keyword or backlink data Requires running and maintaining your own server
Downloadable app	Self-hosted
Closed source	Open source
License not stated	License: MIT
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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