# Proton Authenticator (open-source security app)

> Proton Authenticator is a free, open-source security app for Android. Private, secure, offline 2FA across devices by Proton team. It has 343 GitHub stars and is released under the GPL-3.0-or-later license, and you can install it from F-Droid and Google Play.

Protect your accounts with Proton Authenticator, a private and secure cross-device two-factor authentication (2FA) that works offline. Created by Proton, the creators of Proton Mail, Proton VPN, Proton Drive, and Proton Pass. Proton Authenticator is open-source, end-to-end encrypted, and backed by Swiss privacy laws. It’s the safest way to generate and store your one-time passwords (TOTP) for 2FA Login. Why Proton Authenticator? - Free to use: No Proton account required, ad-free. - Offline support, on mobile and desktop apps - Sync your 2FA codes to all your devices with end-to-end encryption.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/protonpass/android-authenticator |
| Platforms | Android |
| Built with | Kotlin |
| GitHub stars | 343 |
| License | GPL-3.0-or-later (open source) |
| F-Droid | https://f-droid.org/packages/proton.android.authenticator.fdroid/ (package proton.android.authenticator.fdroid) |
| F-Droid anti-features | Relies on a non-free network service; Tracks or reports your activity |
| Google Play | https://play.google.com/store/apps/details?id=proton.android.authenticator |
| App Store | not linked |
| Website | https://proton.me/authenticator |
| Official | no |
| Category | Password managers & security |
| Latest release | none on GitHub |
| Last commit | Jul 24, 2026 |

F-Droid builds its apps from source and flags anti-features: https://f-droid.org/en/docs/Anti-Features/

## Similar mobile apps

- [Aegis Authenticator](https://appsgit.com/mobile-apps/aegis-authenticator): Free, secure and open source 2FA app to manage tokens for your online services. (13,229 stars, GPL-3.0-only)
- [Bitwarden](https://appsgit.com/mobile-apps/bitwarden): Bitwarden mobile apps (Password Manager and Authenticator) for Android. (9,452 stars, GPL-3.0, official)
- [KeePassDX Passkey Vault](https://appsgit.com/mobile-apps/keepassdx-passkey-vault): Manage Passkey / Password in a local and open-source vault. (7,429 stars, GPL-3.0-or-later, official)
- [LessPass](https://appsgit.com/mobile-apps/lesspass): Generate unique passwords for your accounts based on a master password. (6,065 stars, GPL-3.0-only)
- [AliasVault](https://appsgit.com/mobile-apps/aliasvault): Privacy-first Password Manager with Built-in Email Aliasing. (3,159 stars, AGPL-3.0-or-later)
- [AuthPass](https://appsgit.com/mobile-apps/authpass): Keep your passwords safe across all platforms and devices. (2,802 stars, GPL-3.0-only)

---

Canonical page: https://appsgit.com/mobile-apps/proton-authenticator
Source: appsgit (https://appsgit.com), the app store for github. Data from the GitHub API, refreshed nightly.
Machine access: JSON API https://appsgit.com/api/v1/apps (OpenAPI: https://appsgit.com/openapi.json), MCP server https://mcp.appsgit.com/mcp, full index https://appsgit.com/llms-full.txt.