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SSL Labs Server Test vs DigiCert SSL Installation Checker: catalog facts
SSL Labs Server Test	DigiCert SSL Installation Checker
Free Free online service from Qualys.	Free Free to use; DigiCert sells certificates.
Web	Web
Detailed coverage of protocols, ciphers and vulnerabilities Letter grade that is easy to compare	Diagnoses installation and chain problems Related CSR and S/MIME tools on the same site
Public servers only A full test takes a while to run	Focused on installation rather than a full protocol audit Surrounded by a certificate vendor's sales pages
Web application	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.