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testssl.sh vs GF.dev TLS Cipher Suite Scanner: catalog facts
testssl.sh	GF.dev TLS Cipher Suite Scanner
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	Quick check of the negotiated TLS version and cipher suite Nothing to install
Command-line output takes some TLS knowledge to interpret Intended for authorized testing of servers you run or may test	Reports the negotiated suite rather than a full list of supported ciphers Only checks servers reachable from the internet
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.