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The LocalAuth is an AIR Native Extension to enable authenticating users on their device using biometrics (fingerprints and face).

Using this extension you can ensure the user of the device and your application is the authorised user (owner) of the device. In this way you can secure aspects of your application ensuring that unauthorised users aren't gaining access to sensitive information.

The API is very simple and the underlying extension handles all of the authentication and uses a universal UI that your users will be familiar with.


  • Touch ID on iOS;
  • Face ID on iOS;
  • Fingerprint Manager on Android;
  • Single API interface - your code works across supported platforms with no modifications
  • Sample project code and ASDocs reference


  • iOS v9+
  • Android v23+


The documentation site forms the best source of detailed documentation for the extension along with the asdocs.

Quick Example:

if (LocalAuth.service.canAuthenticateWithFingerprint())
LocalAuth.service.addEventListener( LocalAuthEvent.AUTH_SUCCESS, authSuccessHandler );
LocalAuth.service.addEventListener( LocalAuthEvent.AUTH_FAILED, authFailedHandler );
LocalAuth.service.authenticateWithFingerprint( "Unlock access to locked feature" );

More information here:



You can purchase a license for using this extension:

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