Compare software

CheckTLS vs ImmuniWeb SSL Security Test: catalog facts
CheckTLS	ImmuniWeb SSL Security Test
Freemium Basic tests are available to visitors; batch, monitoring and other features need a paid…	Free The test is free; ImmuniWeb also sells commercial security services.
Web	Web
Shows the full SMTP conversation step by step Tests TLS without sending a real email	Tests email servers as well as web servers Compliance checks for PCI DSS, HIPAA and NIST
Cluttered interface with many menus Advanced features require a subscription	Provided as is without warranty Only tests servers reachable from the internet
Web application, Hosted service	Web application
Closed source	Closed source
License not stated	License not stated
No account 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.