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sslscan vs testssl.sh: catalog facts
sslscan	testssl.sh
Free Free and open source under the GPL-3.0 license.	Free Free and open source.
Windows, Linux, Command line	macOS, Linux, Command line
Quick report of supported protocols and cipher suites Rewritten scanning backend in version 2	Tests any port, not only HTTPS on 443 Checks protocols, ciphers and known cryptographic flaws
Command line only, with no graphical interface No packaged releases on the GitHub page	Command-line output takes some TLS knowledge to interpret Intended for authorized testing of servers you run or may test
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-2.0
No account needed	No account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.