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twofas/2fas-android

Open-source Android authenticator app from 2FAS that generates TOTP and HOTP one-time codes for two-factor login.

Open-source alternative to:Google Authenticator

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131
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Last commit
2 days ago

What is it?

This repository holds the source code for the official 2FAS Auth app on Android. The app works as a two-factor authenticator: it generates one-time passwords on the phone that users enter alongside their regular password when signing in to online accounts.

It supports time-based one-time passwords (TOTP) and HMAC-based one-time passwords (HOTP). Because these are open standards, the app can be used with any service that accepts TOTP or HOTP, and the project names Google, Microsoft and Dropbox as examples.

The code is written in Kotlin and licensed under GPL-3.0. Graphics bundled with the app are not covered by that open-source license and carry their own terms.

Key features

  • 01Generates time-based one-time passwords (TOTP).
  • 02Supports HMAC-based one-time passwords (HOTP).
  • 03Works with any service that uses the standard TOTP or HOTP protocols.
  • 04Written in Kotlin for Android.

Use cases

  • Adding a second login factor to accounts on services such as Google or Dropbox.
  • Studying how a production two-factor authenticator app is built on Android.
  • Auditing the source of an authenticator app that handles account secrets.

Quick start

  1. 1

    Download the app from the releases page

  2. 2

    Install the app on your Android device

  3. 3

    Follow the on-screen instructions to set up 2FAS for your online accounts

Things to know

  • Setup is done through the app on Android devices, with no build or run command given in the README.
  • Graphics are not covered by the GPL-3.0 license and have separate terms.

Topics

#two-factor-authentication#totp#hotp#android#kotlin#security#otp

FAQ

What is 2fas-android?
Open-source Android authenticator app from 2FAS that generates TOTP and HOTP one-time codes for two-factor login. This repository holds the source code for the official 2FAS Auth app on Android. The app works as a two-factor authenticator: it generates one-time passwords on the phone that users enter alongside their regular password when signing in to online accounts.
Is 2fas-android free to use? What license does it have?
2fas-android is open source under the GPL-3.0 license. Check the license terms before using it in commercial products.
Is 2fas-android still maintained?
Actively maintained. The last commit to 2fas-android was on Oct 18, 2026.
What can I use 2fas-android for?
Adding a second login factor to accounts on services such as Google or Dropbox. Studying how a production two-factor authenticator app is built on Android. Auditing the source of an authenticator app that handles account secrets.
How do I install 2fas-android?
Download the app from the releases page Install the app on your Android device Follow the on-screen instructions to set up 2FAS for your online accounts
Where can I get 2fas-android?
The source code and installation instructions are on GitHub: https://github.com/twofas/2fas-android

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