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HTMLProofer vs LinkChecker: catalog facts
HTMLProofer	LinkChecker
Free Free and open source.	Free Free and open source under the GPL.
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Command line
Checks generated output rather than source templates Works well in CI for static sites	Recursive, multithreaded crawling of whole sites Many output formats including CSV, XML, SQL and sitemap graphs
Requires a Ruby environment Works on local HTML files rather than crawling live sites	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.