Salesforce does not require the use of a specific authenticator app. However, it does provide support for various authenticator apps that can be used for multi-factor authentication (MFA) purposes. These apps generate time-based one-time passwords (TOTPs) or provide push notifications for users to verify their identity during the login process. Salesforce supports popular authenticator apps like Google Authenticator, Microsoft Authenticator, and Salesforce Authenticator, among others. The choice of which authenticator app to use is typically up to the individual or organization implementing MFA for their Salesforce account.