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muffet vs LinkChecker: catalog facts
muffet	LinkChecker
Free Free and open source.	Free Free and open source under the GPL.
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Command line
Fast concurrent crawling Fits easily into CI pipelines	Recursive, multithreaded crawling of whole sites Many output formats including CSV, XML, SQL and sitemap graphs
Command line only, no graphical interface Focused on links rather than wider SEO or markup checks	Command-line only, no graphical interface The PyPI release may lag behind the latest code
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL
No account needed	No account needed
Not stated if it works offline	Not stated if it works offline
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.