Alternatives to ImmuniWeb SSL Security Test
A free online test of the SSL/TLS setup of a web or email server. The listings below can replace it for an important use case. Each note says what changes if you switch.
The original
ImmuniWeb SSL Security Test
A free online test of the SSL/TLS setup of a web or email server.
Replacements
Listings that take over the same core job as ImmuniWeb SSL Security Test.
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, but covers public web servers only, without email servers or PDF export.
CryptCheck
A web tool that checks the TLS configuration of HTTPS, SMTP and XMPP servers.
CryptCheck also tests mail servers and adds XMPP, with detailed protocol and cipher output, though its interface is in French.
Hardenize
A web site configuration tester and monitoring service for network, certificate and security settings.
Hardenize checks certificates within a broader network and security configuration report and adds continuous monitoring for organisations.
CDN77 TLS Test
A free web checker from CDN77 that lists the SSL and TLS versions a server supports.
CDN77 TLS Test only lists enabled SSL and TLS versions and highlights deprecated ones, without compliance checks or cipher-level detail.
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 just the negotiated TLS version and cipher suite, a quicker but much narrower check than a full compliance audit.
CheckTLS
A web tool that tests whether a recipient's mail server accepts secure TLS connections for email.
CheckTLS focuses on email, showing the full SMTP conversation when testing whether a mail server accepts TLS, with advanced features requiring a subscription.
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 any port, including mail servers, and runs on your own machine instead of in a browser, with output needing TLS knowledge.
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 for automation, trading the web interface and compliance reports for scripting in CI pipelines.
Also worth comparing
These listings name ImmuniWeb SSL Security Test as their own alternative, so the relationship runs both ways.
Check Your Website
Free online checker for a domain's DNS, redirects, certificates, connections and mixed content.
ImmuniWeb SSL Security Test focuses on TLS setup for web and email servers, adding compliance checks and PDF export but no DNS checks.
Decoder.link SSL Checker
An online SSL checker that validates a server's certificate installation, with SNI and STARTTLS support.
ImmuniWeb SSL Security Test covers web and email servers with compliance checks and PDF export, going beyond certificate installation to the full TLS setup.
DigiCert SSL Installation Checker
A DigiCert web tool that diagnoses TLS/SSL certificate installation problems on a server.
ImmuniWeb SSL Security Test audits full TLS setup of web and email servers with PCI DSS, HIPAA and NIST checks and PDF export.
SSL Shopper SSL Checker
An online checker that verifies a server's SSL certificate installation, chain, hostname and expiry.
ImmuniWeb SSL Security Test audits web and email server TLS with compliance checks and PDF export, going beyond a quick installation check.
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.
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.
