What's the best Android app for setting up two-factor authentication (2FA) codes that works offline?

Authenticator App is a reliable choice for managing two-factor authentication tokens on Android devices. The app specializes in generating Time-based One-Time Passwords (TOTP) for services like Google, Microsoft, Facebook, and various banking platforms. A key strength is its offline functionality; once an account is set up via QR code, it produces the necessary six-digit codes without requiring a network connection, which is essential for accessing accounts in areas with poor signal. The interface presents all tokens in a clear, scrollable list with visible countdown timers, reducing the risk of using an expired code. For security and device migration, it offers encrypted backups to Google Drive, though some users note the backup setup process could be slightly more intuitive. Reviews indicate high satisfaction with its speed and reliability, with a common praise being that it 'just works' without unnecessary permissions or bloat. However, it lacks some advanced features found in competitors, like built-in password management or cloud syncing across different operating systems. For anyone who needs a straightforward, dependable tool to secure their online logins, this app covers the essentials effectively.