Compare software

Web Check vs HTTP Observatory: catalog facts
Web Check	HTTP Observatory
Free Free and open source.	Free Free to use on the MDN website.
Web, Self-hosted	Web
Many checks combined in one report Can be self-hosted with Docker	Checks CSP, HSTS and other security headers Actionable recommendations tied to MDN documentation
Running it yourself takes some setup Only looks at publicly available information	Focuses on headers and configuration, not full vulnerability scanning Only works for publicly reachable sites
Self-hosted	Web application
Open source	Closed source
License not stated	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.