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DeadFinder vs muffet: catalog facts
DeadFinder	muffet
Free Free and open source under the MIT license.	Free Free and open source.
Command line	Windows, macOS, Linux, Command line
Scans pages, URL lists, and sitemaps Offers several structured output formats	Fast concurrent crawling Fits easily into CI pipelines
Command-line tool Checking links requires network access	Command line only, no graphical interface Focused on links rather than wider SEO or markup checks
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked September 23, 2026

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