Proton Authenticator
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.
github.com/protonpass/android-authenticator (opens in a new tab)
About Proton Authenticator
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.
Privacy and F-Droid
F-Droid builds Proton Authenticator from its published source code and flags anti-features such as ads, tracking or reliance on non-free services.
- Relies on a non-free network service
- Tracks or reports your activity
Screenshots
Screenshots from the app's F-Droid listing.
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What is Proton Authenticator?
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.
Is Proton Authenticator free and open source?
Yes. Proton Authenticator's source code is public on GitHub under the GPL-3.0-or-later license, which is OSI-approved or FSF-free. F-Droid flags these anti-features on its latest build: relies on a non-free network service; tracks or reports your activity.
How do I install Proton Authenticator?
You can install Proton Authenticator from F-Droid (package proton.android.authenticator.fdroid) and from Google Play; the links are on this page.
Is Proton Authenticator still maintained?
The repository's most recent commit was on Jul 24, 2026. Its F-Droid listing was last updated on Jul 15, 2026. appsgit only lists apps whose repository had a commit in the last six months.