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Seodisias vs Screaming Frog SEO Spider: catalog facts
Seodisias	Screaming Frog SEO Spider
Free The developer says the core crawler and analysis features are free.	Freemium Free for crawls up to 500 URLs; a licence costs £199 per year.
Windows, macOS, Linux	Windows, macOS, Linux
Checks for more than 30 technical issues Can render JavaScript-heavy pages	Runs locally as a desktop app on all three major systems Checks over 300 issues including redirects and duplicates
Windows and Linux builds are not code-signed	Free version limited to 500 URLs Advanced features need a paid yearly licence
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
No account needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked September 23, 2026

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