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Screaming Frog SEO Spider vs InterroBot: catalog facts
Screaming Frog SEO Spider	InterroBot
Freemium Free for crawls up to 500 URLs; a licence costs £199 per year.	Freemium A free Community Edition is available, with paid Plus and Pro upgrades.
Windows, macOS, Linux	Windows, macOS, Linux, Android, iOS
Runs locally as a desktop app on all three major systems Checks over 300 issues including redirects and duplicates	Searches site content and filters CSS classes, scripts, image sources, HTTP details, and response times Helps find HTTP errors and redirects
Free version limited to 500 URLs Advanced features need a paid yearly licence	Some features require Plus or Pro licensing
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
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 8, 2026

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