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W3C Link Checker vs Sitechecker Broken Link Checker: catalog facts
W3C Link Checker	Sitechecker Broken Link Checker
Free Free to use on the W3C website.	Freemium Free checks are available; the full platform and ongoing monitoring are paid.
Web	Web, Browser extension
Checks anchors as well as full URLs Recursive crawling with a configurable depth	Broken links reported alongside a wider technical SEO audit Companion Chrome extension
Plain interface with a text-heavy report Works best when the pages already have valid markup	Heavily oriented toward selling the paid SEO platform More than needed if you only want a link check
Web application	Web application, Browser extension
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Needs internet	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.