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testssl.shssllabs-scan
Free

Free and open source.

 Free

The command-line client is open source under Apache-2.0; SSL Labs API use is free with…

macOS, Linux, Command line Command line
  • Tests any port, not only HTTPS on 443
  • Checks protocols, ciphers and known cryptographic flaws
  • Supports scheduled and bulk server assessments
  • Uses the SSL Labs reference API client
  • Command-line output takes some TLS knowledge to interpret
  • Intended for authorized testing of servers you run or may test
  • Requires access to the SSL Labs API
  • API use is subject to restrictions
Downloadable app Downloadable app
Open source Open source
License: GPL-2.0 License: Apache-2.0
No account needed Account needed
Needs internet Needs internet

Checked September 23, 2026

Checked October 8, 2026

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