I use this app during the piano lessons that I teach and have found it extremely helpful to send students away with to practise note recognition. Unfortunately, the app is useless on my Samsung Galaxy S6 Edge Plus, as the button that accesses the app settings is designed to minimise all open apps rather than access the app settings. This results in only being able to use the app on easy treble clef option. It would be great if you could update the app to function on the new Samsung phones in all its glory.
My Little Note for Android at Google Play market analyse