Compare software

htmltest vs muffet: catalog facts
htmltest	muffet
Free Free and open source.	Free Free and open source.
Command line	Windows, macOS, Linux, Command line
No Ruby environment needed, unlike html-proofer Single Go program that also runs in Docker	Fast concurrent crawling Fits easily into CI pipelines
Works on generated files, not on live dynamic sites Command line only, with no graphical interface	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 not stated	License not stated
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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