The biggest problem with Android apps is calibration. There's hundreds of models, each with different microphones, available. Even the hardware used on seemingl

The biggest problem with Android apps is calibration. There's hundreds of models, each with different microphones, available. Even the hardware used on seemingly the same phone models often varies depending on the batch and country. I have an app (Sound Meter) which apparently downloads calibration data for a number of popular phone models. This is probably the only realistic solution when you're faced with such a wide variety of hardware. I have no idea how accurate the calibration is though. It's a byproduct of Apples total ecosystem control that developers have a very good idea of what hardware users have. This has upsides and downsides - with other phone ecosystems you lose accurate sound meters, but you gain a wider variety of devices running the same operating system.