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