Browse Open Source Google Authenticator alternatives

Google Authenticator is a free mobile app developed by Google that provides two-factor authentication (2FA) to enhance account security. It generates time-based, one-time passcodes (TOTP) or counter-based codes (HOTP) that users enter along with their password when signing into supported services. By scanning a QR code or entering a setup key, users can link the app to their accounts, ensuring that even if a password is stolen, unauthorized access is far less likely without the corresponding code from the app. It works offline, making it both secure and convenient for protecting online accounts.