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