The ONE Smart Piano App is FREE to download and use with your iOS or Android mobile devices (including your tablets and smartphones). Otherwise, without the app, the piano works like any other digital piano in that you simply turn it on and play!
All of the public domain content are for free - over 2000 classical master pieces. And the systematic piano tutorial from our partner Hoffman Academy is also for free.
Only the copyrighted content, mostly pop music, is for sale from $0.99.