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Security Headers vs Web Check: catalog facts
Security Headers	Web Check
Free Free to scan sites in the browser.	Free Free and open source.
Web	Web, Self-hosted
Simple A+ to F grade that is easy to share Option to hide results and follow redirects	Many checks combined in one report Can be self-hosted with Docker
Scans appear in a public recent list unless hidden Covers headers only, not TLS or application flaws	Running it yourself takes some setup Only looks at publicly available information
Web application	Self-hosted
Closed source	Open source
License not stated	License not stated
Not stated if an account is needed	No account needed
Needs internet	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.