Alternatives to CryptCheck
A web tool that checks the TLS configuration of HTTPS, SMTP and XMPP servers. The listings below can replace it for an important use case. Each note says what changes if you switch.
The original
CryptCheck
A web tool that checks the TLS configuration of HTTPS, SMTP and XMPP servers.
Replacements
Listings that take over the same core job as CryptCheck.
SSL Labs Server Test
A Qualys web service that analyses the TLS/SSL configuration of a public web server.
SSL Labs Server Test gives a detailed protocol, cipher and vulnerability audit with a letter grade and English interface, but covers public web servers rather than SMTP or XMPP.
ImmuniWeb SSL Security Test
A free online test of the SSL/TLS setup of a web or email server.
ImmuniWeb SSL Security Test covers web and email servers, adds PCI DSS, HIPAA and NIST compliance and post-quantum checks, with PDF export.
CheckTLS
A web tool that tests whether a recipient's mail server accepts secure TLS connections for email.
CheckTLS focuses on mail servers, showing the full SMTP conversation step by step, with advanced features behind a subscription and no XMPP support.
CDN77 TLS Test
A free web checker from CDN77 that lists the SSL and TLS versions a server supports.
CDN77 TLS Test lists enabled SSL and TLS versions and highlights deprecated ones, with less detail than CryptCheck and no mail or XMPP focus.
GF.dev TLS Cipher Suite Scanner
A free web tool that reports the TLS version and cipher suite a server negotiates.
GF.dev TLS Cipher Suite Scanner reports only the negotiated TLS version and cipher suite of a web server, with linked guides in English.
Hardenize
A web site configuration tester and monitoring service for network, certificate and security settings.
Hardenize tests network, certificate and security configuration for a domain and adds continuous monitoring aimed at organisations.
testssl.sh
A free command-line tool that checks a server's TLS/SSL ciphers, protocols and cryptographic flaws.
testssl.sh is an open-source command-line script that tests TLS on any port, including mail servers, run from your own machine.
SSLyze
Open-source command-line scanner and Python library that analyzes a server's SSL/TLS configuration.
SSLyze is an open-source command-line scanner and Python library with JSON output, suited to automation instead of a web interface.
Similar software
Related functionality, not a direct replacement.
Internet.nl
A web test that checks websites, mail domains and connections for modern Internet standards support.
Decoder.link SSL Checker
An online SSL checker that validates a server's certificate installation, with SNI and STARTTLS support.
HTTP Observatory
Mozilla's web tool that grades a site's HTTP security headers and gives fix recommendations.
CAA Test
A web tool that checks the DNS CAA records published for a domain.
