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W3C Link Checker vs Xenu's Link Sleuth: catalog facts
W3C Link Checker	Xenu's Link Sleuth
Free Free to use on the W3C website.	Free Free to download and use.
Web	Windows
Checks anchors as well as full URLs Recursive crawling with a configurable depth	Checks links, images, scripts and style sheets Re-checks failures and reports redirects
Plain interface with a text-heavy report Works best when the pages already have valid markup	Windows only, with no plans for other platforms Dated interface and limited development
Web application	Downloadable app
Closed source	Closed source
License not stated	License not stated
No account needed	No account needed
Needs internet	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.