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Ahrefs Free vs Screaming Frog SEO Spider: catalog facts
Ahrefs Free	Screaming Frog SEO Spider
Freemium Free for verified websites; paid Ahrefs plans add more tools and data.	Freemium Free for crawls up to 500 URLs; a licence costs £199 per year.
Web, Browser extension	Windows, macOS, Linux
Technical site audit at no cost Backlink and keyword ranking data from Ahrefs' index	Runs locally as a desktop app on all three major systems Checks over 300 issues including redirects and duplicates
Requires an account and site ownership verification Full data for other people's sites needs a paid plan	Free version limited to 500 URLs Advanced features need a paid yearly licence
Web application, Browser extension	Downloadable app
Closed source	Closed source
License not stated	License not stated
Account needed	No account 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.