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testssl.sh vs SSLyze: catalog facts
testssl.sh	SSLyze
Free Free and open source.	Free Free and open source.
macOS, Linux, Command line	Command line
Tests any port, not only HTTPS on 443 Checks protocols, ciphers and known cryptographic flaws	Fast TLS configuration scanning from the command line JSON output suited to automation
Command-line output takes some TLS knowledge to interpret Intended for authorized testing of servers you run or may test	No graphical interface Output assumes some knowledge of TLS
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License not stated
No account needed	No account needed
Needs internet	Not stated if it works offline
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.