About
Test TLS is a free online scanner for TLS configuration of servers. It checks a domain name or IP address on a specified TCP port and reports TLS configuration settings, security vulnerabilities, and the server's X.509 certificate.
The service supports autodetection by TCP port and several STARTTLS modes, including FTP, Telnet, SMTP, POP3, NNTP, IMAP, LDAP, MySQL, XMPP, and PostgreSQL. It is aimed at developers and operators who need a browser-based TLS check without installing local tooling.
- TLS configuration scanning for servers
- X.509 certificate download
- TCP port selection and autodetect
- STARTTLS support for common protocols
- Security vulnerability checks
Free Tier Value
This free tier appears to be fully open and perpetual, with no usage cap, trial clock, or credit-card gate mentioned. Because it is an uncapped always-free offering, there is no defensible monthly dollar equivalent to estimate against a paid plan.
What's included in the free tier
Verified
- Access to a free online TLS server scanner for checking server TLS configuration.
- Ability to test a TLS server on any port.
- Support for entering a domain name or IP address to check TLS settings.
- Ability to use advanced protocol options, including STARTTLS for common services.
See Test TLS pricing for current limits.
Common questions
Is Test TLS free forever?
Yes. Test TLS is free forever, with no time limit and no usage threshold that forces a paid plan.
What is Test TLS's free tier worth?
Test TLS's free tier has no dollar cap - it's unlimited, with no usage threshold that forces a paid plan. That maps to an FTV score of 90/100. The FTV score is explained at freetier.co/ftv.
