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

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