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Screaming Frog SEO Spider vs Xenu's Link Sleuth: catalog facts
Screaming Frog SEO Spider	Xenu's Link Sleuth
Freemium Free for crawls up to 500 URLs; a licence costs £199 per year.	Free Free to download and use.
Windows, macOS, Linux	Windows
Runs locally as a desktop app on all three major systems Checks over 300 issues including redirects and duplicates	Checks links, images, scripts and style sheets Re-checks failures and reports redirects
Free version limited to 500 URLs Advanced features need a paid yearly licence	Windows only, with no plans for other platforms Dated interface and limited development
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	Needs internet
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.