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Scales Tutor for iPhone and Scales Tutor (for iPad) are available at the App Store.
                            For iPad, iPhone and Android

  Scales Tutor for iPad     
  Scales Tutor (for iPhone)
https://play.google.com/store/apps/details?id=com.musikeys.scalestutor   Scales Tutor (
for Android)

Piano Technical Exercises: Interactive!  
https://itunes.apple.com/us/app/superscore-music/id1000377224?mt=8