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SIGMA is meant to complement the SSL/TLS Scanning Service provided by SSLLabs and not replace it. SSLLabs requires you to do the scanning and archiving of results manually which is okay if you only have one or two sites. If you have more sites this can become quite tedious. SIGMA automates this for you by submitting your site for testing to SSLLabs and archives the results. SIGMA also does a quick evaluation for the most common problems. For a detailed analysis checking the results at SSLLabs is always recommended.
SSL/TLS server assessment service provided in partnership with Qualys SSL Labs (https://www.ssllabs.com)