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testssl.sh vs SSL Labs Server Test: catalog facts
testssl.sh	SSL Labs Server Test
Free Free and open source.	Free Free online service from Qualys.
macOS, Linux, Command line	Web
Tests any port, not only HTTPS on 443 Checks protocols, ciphers and known cryptographic flaws	Detailed coverage of protocols, ciphers and vulnerabilities Letter grade that is easy to compare
Command-line output takes some TLS knowledge to interpret Intended for authorized testing of servers you run or may test	Public servers only A full test takes a while to run
Downloadable app	Web application
Open source	Closed source
License: GPL-2.0	License not stated
No account needed	Not stated if an account is 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.