testssl.sh vs Decoder.link SSL Checker: catalog facts
 testssl.sh |  Decoder.link SSL Checker |
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Free Free and open source. |
Free Free to use in the browser. |
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macOS, Linux, Command line |
Web |
- Tests any port, not only HTTPS on 443
- Checks protocols, ciphers and known cryptographic flaws
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- Checks any port, with SNI and STARTTLS support
- Many related certificate tools on the same site
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- Command-line output takes some TLS knowledge to interpret
- Intended for authorized testing of servers you run or may test
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- Focused on certificate installation rather than a full cipher audit
- Tied to a certificate seller's site
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Downloadable app |
Web application |
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Open source |
Closed source |
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License: GPL-2.0 |
License not stated |
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No account needed |
Not stated if an account is needed |
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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.
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