Two Factor Authentication - Bitwarden Authenticator

Bitwarden Authenticator is a free and open source multi factor authenticator for Android and iOS
supporting Time-based one-time password (TOTP) standard algorithm with a locally encrypted vault
using AES-256 protected by a password or biometrics (face or fingerprint unlock) using Keychain on
iOS and Keystore on Android. Despite being a standalone application it provides seamless integration
with its homonymous password manager. New entries are added using QR code, entered manually or
imported from other applications. With its data easily backed up or exported in several formats.