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LinkChecker vs htmltest: catalog facts
LinkChecker	htmltest
Free Free and open source under the GPL.	Free Free and open source.
Windows, macOS, Linux, Command line	Command line
Recursive, multithreaded crawling of whole sites Many output formats including CSV, XML, SQL and sitemap graphs	No Ruby environment needed, unlike html-proofer Single Go program that also runs in Docker
Command-line only, no graphical interface The PyPI release may lag behind the latest code	Works on generated files, not on live dynamic sites Command line only, with no graphical interface
Downloadable app	Downloadable app
Open source	Open source
License: GPL	License not stated
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

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