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SSL Labs Server Test vs testssl.sh: catalog facts
SSL Labs Server Test	testssl.sh
Free Free online service from Qualys.	Free Free and open source.
Web	macOS, Linux, Command line
Detailed coverage of protocols, ciphers and vulnerabilities Letter grade that is easy to compare	Tests any port, not only HTTPS on 443 Checks protocols, ciphers and known cryptographic flaws
Public servers only A full test takes a while to run	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
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.