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ImmuniWeb SSL Security Test vs testssl.sh: catalog facts
ImmuniWeb SSL Security Test	testssl.sh
Free The test is free; ImmuniWeb also sells commercial security services.	Free Free and open source.
Web	macOS, Linux, Command line
Tests email servers as well as web servers Compliance checks for PCI DSS, HIPAA and NIST	Tests any port, not only HTTPS on 443 Checks protocols, ciphers and known cryptographic flaws
Provided as is without warranty Only tests servers reachable from the internet	Command-line output takes some TLS knowledge to interpret Intended for authorized testing of servers you run or may test
Web application	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0
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.