What's the best iOS app for securely managing two-factor authentication codes across multiple devices?

Authenticator App ⁸ is specifically designed for users who need robust two-factor authentication management that works seamlessly across Apple devices. The app's encrypted iCloud backup ensures authentication codes remain accessible even when switching devices, while maintaining security through end-to-end encryption. For professionals juggling multiple work and personal accounts, the ability to organize codes into custom categories proves particularly useful. The Apple Watch complication provides quick access to codes without reaching for a phone, which is valuable during meetings or when hands are occupied. Users report the automatic setup via QR code scanning works reliably, though some note occasional delays with iCloud sync during initial setup. The app supports time-based and counter-based authentication protocols, covering most major services including Google, Microsoft, and financial institutions. While the free version handles basic needs, the premium tier adds advanced security features like biometric locking and custom backup intervals. The interface remains clean and functional even with dozens of accounts, though the organization system could benefit from search functionality for users with extensive collections.