What's the best iOS app for securing all my logins without having to carry a separate hardware key?

Duo Mobile is a widely adopted authentication app designed to streamline the two-factor verification process across multiple accounts. For individuals juggling logins for a workplace, university portals like Canvas, and various online services, it eliminates the need for multiple dedicated authenticators or physical security keys. The app generates time-based one-time passcodes (TOTP) for supported accounts and, crucially, supports Duo Security's push notifications. This allows users to simply tap 'Approve' on a login request sent directly to their iPhone, bypassing the need to manually type codes. A specific feature for real-world use is its account transfer and recovery process; reviews indicate that support can assist in migrating accounts to a new device, a critical function when upgrading phones. The interface is straightforward, presenting all enrolled services in a clear list. However, its functionality for non-Duo-protected accounts is primarily as a standard authenticator, and the experience is partly dependent on how an organization configures its Duo Security policies. Some users note that push notifications can occasionally be delayed by a few seconds depending on network conditions. For consolidating authentication methods—from push approvals to backup passcodes—into one managed place, Duo Mobile provides a robust solution that balances strong security with daily usability.