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