Accessible tuning fork app

Hello,

I have been looking for an accessible tuning fork app.

Something simple, I just need to press a button and hear a clear 440 hz tone to get the A note or, preferablyy, have one button to each natural and sharp notes.

I let it clear though that I am not looking for a piano app, it is important to me to have at least the A clearly labeled button and hopefully some others also labeled with their corresponding note.