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