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LinkChecker vs Sitechecker Broken Link Checker: catalog facts
LinkChecker	Sitechecker Broken Link Checker
Free Free and open source under the GPL.	Freemium Free checks are available; the full platform and ongoing monitoring are paid.
Windows, macOS, Linux, Command line	Web, Browser extension
Recursive, multithreaded crawling of whole sites Many output formats including CSV, XML, SQL and sitemap graphs	Broken links reported alongside a wider technical SEO audit Companion Chrome extension
Command-line only, no graphical interface The PyPI release may lag behind the latest code	Heavily oriented toward selling the paid SEO platform More than needed if you only want a link check
Downloadable app	Web application, Browser extension
Open source	Closed source
License: GPL	License not stated
No account needed	Not stated if an account is 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.