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Security Headers vs Webbkoll: catalog facts
Security Headers	Webbkoll
Free Free to scan sites in the browser.	Free Free to use, run by a non-profit foundation.
Web	Web
Simple A+ to F grade that is easy to share Option to hide results and follow redirects	Covers cookies, third parties, HTTPS and security headers in one report Checks HTTP to HTTPS redirects
Scans appear in a public recent list unless hidden Covers headers only, not TLS or application flaws	Some sites fail to scan correctly Simulates a single default browser visit
Web application	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account 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.