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