I want to make a simple app which requires a simple pin code auth only

Question

Some app which includes personal info often requires login function, but I want to minimize it into pin code only.

I googled all over the place, but I am a bit confused because in many cases pin auth means what requires SMS authentication or NATIVE_APP PIN authentication.

I just want my app to ask 4~6 simple pin codes, instead of full login function. But I don't know which flutter package I should use... And one more, should I use the local storage or the firebase?

If you have no time, a link or short notice will also be truly appreciated. Thank you for reading.

I googled 'pin auth', 'pin code', etc. for several days... But all of them are either too out-dated or not for my case. There's a possibility that I don't know the keywords to search, since I am a newbie here. Help me out with your ideas please...

Answer 1

One option is to use local_auth. It includes authentication with biometrics too.

try {
  final bool didAuthenticate = await auth.authenticate(
      localizedReason: 'Please authenticate');
  // ···
} on PlatformException {
  // ...
}