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Screaming Frog SEO Spider vs LinkChecker: catalog facts
Screaming Frog SEO Spider	LinkChecker
Freemium Free for crawls up to 500 URLs; a licence costs £199 per year.	Free Free and open source under the GPL.
Windows, macOS, Linux	Windows, macOS, Linux, Command line
Runs locally as a desktop app on all three major systems Checks over 300 issues including redirects and duplicates	Recursive, multithreaded crawling of whole sites Many output formats including CSV, XML, SQL and sitemap graphs
Free version limited to 500 URLs Advanced features need a paid yearly licence	Command-line only, no graphical interface The PyPI release may lag behind the latest code
Downloadable app	Downloadable app
Closed 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.