Proton Authenticator vs TwoFac
Proton Authenticator
proton.meTwoFac
twofac.appSide by side
| Figure | Proton Authenticator | TwoFac |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | — | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| iOS | Yes | Yes |
| Android | Yes | Yes |
| Plans published | 2 | 1 |
| Spec score · Authenticator apps | 8.8 (#9) | 8.3 (#30) |
| Code type | totp | totp and hotp |
| Encrypted backup | Yes | Yes |
| Free plan | Yes | Yes |
| Multi-device sync | Yes | Yes |
| Open source | Proton Authenticator is open source, and Proton says anyone can inspect its code. | TwoFac is released under the MIT license, and its source code is available for review on GitHub. |
| Purpose | Proton Authenticator generates time-based, one-time 2FA codes on your device for an extra layer of account login security. | TwoFac is an open-source authenticator that generates time-based one-time passwords (TOTP) for online accounts. |
| Support | The product page links to Proton product support. | The FAQ directs users to GitHub Discussions for questions, and the maker invites bug reports and contributions through GitHub. |
| Supported platforms | iOS,Android,macOS,Windows,Linux | Android,iOS,macOS,Windows,Linux,Web,Chrome,Firefox,Wear OS,watchOS,CLI |
Plans
In their own words
Proton Authenticator
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.