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DigiCert SSL Installation Checker vs SSL Labs Server Test: catalog facts
DigiCert SSL Installation Checker	SSL Labs Server Test
Free Free to use; DigiCert sells certificates.	Free Free online service from Qualys.
Web	Web
Diagnoses installation and chain problems Related CSR and S/MIME tools on the same site	Detailed coverage of protocols, ciphers and vulnerabilities Letter grade that is easy to compare
Focused on installation rather than a full protocol audit Surrounded by a certificate vendor's sales pages	Public servers only A full test takes a while to run
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.