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CDN77 TLS Test vs testssl.sh: catalog facts
CDN77 TLS Test	testssl.sh
Free Free to use in the browser.	Free Free and open source.
Web	macOS, Linux, Command line
Lists all enabled SSL and TLS versions Highlights deprecated protocols in red	Tests any port, not only HTTPS on 443 Checks protocols, ciphers and known cryptographic flaws
Page includes promotion for CDN77's CDN service Less detail than dedicated TLS audit tools	Command-line output takes some TLS knowledge to interpret Intended for authorized testing of servers you run or may test
Web application	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0
Not stated if an account is needed	No account needed
Needs internet	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.