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Decoder.link SSL Checker vs testssl.sh: catalog facts
Decoder.link SSL Checkertestssl.sh
Free

Free to use in the browser.

Free

Free and open source.

Web macOS, Linux, Command line
  • Checks any port, with SNI and STARTTLS support
  • Many related certificate tools on the same site
  • Tests any port, not only HTTPS on 443
  • Checks protocols, ciphers and known cryptographic flaws
  • Focused on certificate installation rather than a full cipher audit
  • Tied to a certificate seller's site
  • 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

Checked September 23, 2026

Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.