Compare software

Internet.nl vs CheckTLS: catalog facts
Internet.nl	CheckTLS
Free Free to use online.	Freemium Basic tests are available to visitors; batch, monitoring and other features need a paid…
Web, Self-hosted	Web
Tests website, email and connection setup in one place Covers IPv6, DNSSEC, TLS, DMARC, DANE and RPKI	Shows the full SMTP conversation step by step Tests TLS without sending a real email
Checks standards compliance rather than site speed or content The score reflects the project's own weighting of standards	Cluttered interface with many menus Advanced features require a subscription
Web application, Self-hosted	Web application, Hosted service
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.