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SSL Labs Server Test vs SSLyze: catalog facts
SSL Labs Server Test	SSLyze
Free Free online service from Qualys.	Free Free and open source.
Web	Command line
Detailed coverage of protocols, ciphers and vulnerabilities Letter grade that is easy to compare	Fast TLS configuration scanning from the command line JSON output suited to automation
Public servers only A full test takes a while to run	No graphical interface Output assumes some knowledge of TLS
Web application	Downloadable app
Closed source	Open source
License not stated	License not stated
Not stated if an account is 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.