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LinkChecker vs W3C Link Checker: catalog facts
LinkChecker	W3C Link Checker
Free Free and open source under the GPL.	Free Free to use on the W3C website.
Windows, macOS, Linux, Command line	Web
Recursive, multithreaded crawling of whole sites Many output formats including CSV, XML, SQL and sitemap graphs	Checks anchors as well as full URLs Recursive crawling with a configurable depth
Command-line only, no graphical interface The PyPI release may lag behind the latest code	Plain interface with a text-heavy report Works best when the pages already have valid markup
Downloadable app	Web application
Open source	Closed source
License: GPL	License not stated
No account needed	No account needed
Not stated if it works offline	Needs internet
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.