Aegis Authenticator vs Proton Authenticator Comparison

The secrets live in a vault file on the phone. The app has no internet permission and no account, so there is no copy with the developers. Setup offers a password by default; choosing no password leaves the vault unencrypted on the phone.

Without sync, the secrets stay on the device, encrypted with a random key kept in the system key store (Android Keystore, Apple Keychain, Windows Credential Manager or a Linux Secret Service). With sync, Proton stores an encrypted copy; by Proton's account, only your Proton account key can open it. That is Proton's statement: no independent audit of the app has been published.

Automatic backups are off until you switch them on and pick a folder, which can belong to a cloud app on the phone. Android's own cloud backup can also include the vault after you switch it on. Both work only with a password-protected vault and use your password or a separate backup password. Android's direct phone-to-phone transfer is always allowed to include the vault.

Sync to a Proton account is off until you sign in. Automatic backup files to a folder you choose are also off by default on Android; the iPhone app offers them during setup. Backup and export files can be protected with a password of your own. On Apple devices, iCloud sync is a separate switch, off by default.

There is no account and no sign-up; the app works fully offline.

A Proton account is needed only for sync between devices. Google Play's data-safety section lists an email address as the only data collected.

The Google Play listing gives Beem Development's contact address in Dordrecht, Netherlands. The app has no servers and holds no user data with the developers, so the jurisdiction matters little for the secrets themselves.

Published by Proton AG, Route de la Galaise 32, 1228 Plan-les-Ouates, Geneva. Proton's privacy policy says it discloses the limited user data it holds only when legally obliged, on a binding request from the competent Swiss authorities.

Beem Development is the developer name on Google Play, F-Droid and the website. Most of the code on GitHub comes from two developers, and the project is funded by donations; no company registration is named on the project's pages.

Proton AG's primary shareholder is the Proton Foundation, a Swiss non-profit registered in Geneva; Proton says no change of control can happen without the Foundation's consent.

The README and F-Droid link a donation page; there is no paid version.

The app has no paid tier and no ads and brings in no revenue of its own; Proton AG develops it alongside its other services.