Scales Tutor for iPhone and Scales Tutor (for iPad) are available at the App Store. IMPORTANT iPad vs. 2.2 is now compatible with IOS 12. Update for iPhone coming soon.
                            For iPad, iPhone and Android ***v. 2.2 (for iPad) is compatible with IOS 12 and available for download!

  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!