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ImmuniWeb SSL Security Test vs sslscan: catalog facts
ImmuniWeb SSL Security Test	sslscan
Free The test is free; ImmuniWeb also sells commercial security services.	Free Free and open source under the GPL-3.0 license.
Web	Windows, Linux, Command line
Tests email servers as well as web servers Compliance checks for PCI DSS, HIPAA and NIST	Quick report of supported protocols and cipher suites Rewritten scanning backend in version 2
Provided as is without warranty Only tests servers reachable from the internet	Command line only, with no graphical interface No packaged releases on the GitHub page
Web application	Downloadable app
Closed source	Open source
License not stated	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.