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CheckTLS vs Decoder.link SSL Checker: catalog facts
CheckTLS	Decoder.link SSL Checker
Freemium Basic tests are available to visitors; batch, monitoring and other features need a paid…	Free Free to use in the browser.
Web	Web
Shows the full SMTP conversation step by step Tests TLS without sending a real email	Checks any port, with SNI and STARTTLS support Many related certificate tools on the same site
Cluttered interface with many menus Advanced features require a subscription	Focused on certificate installation rather than a full cipher audit Tied to a certificate seller's site
Web application, Hosted service	Web application
Closed source	Closed source
License not stated	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.