Piano Adventures Player for iphone from Dovetree Productions Inc.
The app includes two play-along tracks with full musical accompaniments so you can play along with the accompaniments in your books.
PianoAdventures.com/player has a simple and intuitive design that's appropriate for all ages. The Play-Along Music Track buttons are right at the top of the screen for easy access. You can practice different exercises for each finger, and each exercise has its own animation. You can tap an exercise for the selected hand or switch hands to practice exercises. The exercises range in difficulty from easy to advanced. You can add notes to the exercises and practice writing them.
