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