Fairly sure that this is indeed doable for an app developer. I use 1Password on OSX and multiple iOS devices and many of my passwords can be unlocked with my f

Fairly sure that this is indeed doable for an app developer. I use 1Password on OSX and multiple iOS devices and many of my passwords can be unlocked with my fingerprint instead of requiring my main & lengthy master password. IIRC it does require the master password once, perhaps each boot, but after that I'm able to unlock with only fingerprint (this is customizable globally or on a per-password basis pretty sure).