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Two factor authentication
'''N.B''' According to a "disclaimer" on the website, the Current Version of the
Android app is now proprietary and it isn't clear whether the source code
repository will be getting any more updates.

This can be used with non-Google apps that support it , but the most common use
will be to login to Google or other accounts in a web browser. You will probably
need to be installed, though for some
accounts it may be possible to type in keys.

The Google Authenticator project includes implementations of one-time passcode
generators for several mobile platforms, as well as a pluggable authentication
module (PAM). One-time passcodes are generated using open standards developed by
the Initiative for Open Authentication (OATH) (which is unrelated to OAuth).

These implementations support the HMAC-Based One-time Password (HOTP) algorithm
specified in RFC 4226 and the Time-based One-time Password (TOTP) algorithm
specified in RFC 6238.


Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

Download F-Droid
  • Version 2.21 (21) - Added on 2012-08-23

    This version requires Android 2.1 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    • control vibration
      Allows the app to control the vibrator.
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.

    Download APK 0.7 MiB PGP Signature | Build Log