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Decoder.link SSL Checker vs CheckTLS: catalog facts
Decoder.link SSL Checker	CheckTLS
Free Free to use in the browser.	Freemium Basic tests are available to visitors; batch, monitoring and other features need a paid…
Web	Web
Checks any port, with SNI and STARTTLS support Many related certificate tools on the same site	Shows the full SMTP conversation step by step Tests TLS without sending a real email
Focused on certificate installation rather than a full cipher audit Tied to a certificate seller's site	Cluttered interface with many menus Advanced features require a subscription
Web application	Web application, Hosted service
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account 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.