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HTTP Observatory vs Internet.nl: catalog facts
HTTP Observatory	Internet.nl
Free Free to use on the MDN website.	Free Free to use online.
Web	Web, Self-hosted
Checks CSP, HSTS and other security headers Actionable recommendations tied to MDN documentation	Tests website, email and connection setup in one place Covers IPv6, DNSSEC, TLS, DMARC, DANE and RPKI
Focuses on headers and configuration, not full vulnerability scanning Only works for publicly reachable sites	Checks standards compliance rather than site speed or content The score reflects the project's own weighting of standards
Web application	Web application, Self-hosted
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.