The sslscan on this site is based on testssl.sh and is capable of testing any TLS enabled protocol/port. STARTTLS is available for common protocols as well.
The result will include a set of vulnerability tests to detect misconfiguration and possible improvements.
I think it's useful to provide this test-suite for browser usage since it's currently a challenge to find a scanner which supports TLSv1.3 and any protocol.
For Webservers and Mailservers there are very specialized and detailed tests available somewhere else:
- HTTP: https://www.ssllabs.com/ssltest/
- IMAP & SMTP: https://www.immuniweb.com/ssl/
It takes approximately 2 minutes to finish the test!