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LinkChecker vs HTMLProofer: catalog facts
LinkChecker	HTMLProofer
Free Free and open source under the GPL.	Free Free and open source.
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Command line
Recursive, multithreaded crawling of whole sites Many output formats including CSV, XML, SQL and sitemap graphs	Checks generated output rather than source templates Works well in CI for static sites
Command-line only, no graphical interface The PyPI release may lag behind the latest code	Requires a Ruby environment Works on local HTML files rather than crawling live sites
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	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.