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Hardenize vs HTTP Observatory: catalog facts
Hardenize	HTTP Observatory
Freemium The public report is free; continuous monitoring is a paid service.	Free Free to use on the MDN website.
Web	Web
Free public configuration report for any domain Continuous certificate and perimeter monitoring for organisations	Checks CSP, HSTS and other security headers Actionable recommendations tied to MDN documentation
Monitoring features are aimed at organisations rather than individuals Little public detail about pricing	Focuses on headers and configuration, not full vulnerability scanning Only works for publicly reachable sites
Web application, Hosted service	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is 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.