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Xenu's Link Sleuth vs muffet: catalog facts
Xenu's Link Sleuth	muffet
Free Free to download and use.	Free Free and open source.
Windows	Windows, macOS, Linux, Command line
Checks links, images, scripts and style sheets Re-checks failures and reports redirects	Fast concurrent crawling Fits easily into CI pipelines
Windows only, with no plans for other platforms Dated interface and limited development	Command line only, no graphical interface Focused on links rather than wider SEO or markup checks
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
No account needed	No account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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