Proton Authenticator vs Zoho OneAuth

Proton Authenticator generates time-based one-time codes for two-factor authentication, adding a code at login to help secure accounts. It can display codes without an internet connection, and a Proton Account is not required to use it. Signing in is optional and enables code syncing across devices. Users can import codes from Google Authenticator, 2FAS, Aegis Authenticator, Bitwarden Authenticator, Ente Auth, and LastPass Authenticator, then export their codes from the app. Backups can be stored locally or in the cloud, with end-to-end encrypted sync between devices. Proton says its servers cannot access synced data in unencrypted form; when sync is on, entries are protected with 256-bit AES-GCM. The app is open source, and its vault can be unlocked with face or fingerprint recognition. It is available for Android, iOS, Linux, macOS, and Windows; Android is also available through F-Droid. Proton Authenticator is free on all listed platforms, with no ads or tracking.

Zoho OneAuth is a free authenticator for Zoho work accounts and personal online accounts. It supports time-based one-time passwords, push approvals, and QR-code login; Zoho accounts can also use passwordless sign-in. For organizations, Zoho Directory lets IT administrators configure multifactor authentication across employees’ Zoho accounts. OneAuth also supports third-party accounts such as Google, Adobe, Github, Zoom, X, Instagram, and LinkedIn.

A passphrase can help restore access after a device is lost or reset, or the app is removed, and can synchronize OTP codes across devices. Encrypted backup and multi-device sync are supported. Biometrics can unlock the app, while remote logout removes unwanted sessions. A sign-in restriction can block future logins to a Zoho account until disabled. The app is available for Android, iOS, Windows, and macOS, and supports phones, tablets, laptops, smart watches, and desktops. Its listed free plan includes time-based OTP authentication, backup and recovery, multi-device support, and passwordless Zoho sign-in.