Yes, Echidna supports biometric login to Salesforce by using Active Directory Federation Services (ADFS) Plug-In where Echidna server provides second factor authentication (2FA) which is stronger than passwords.

By using Echidna’s Active Directory Federation Services (ADFS) Plug-In, users can authenticate into Salesforce using an Echidna supported security token, such as Salt Mobile on devices that support biometrics hardware for a biometric login.