Not worth it
This app is a glorified note/interval/chord quiz app with no timer, movement, or any other aspect to keep it interesting. It offers no explanation of why or how the app arrived at a given answer, so its of little value to someone new to music theory. It also uses note names you will never encounter in music like C-flat and E-sharp. You can find decent note quiz apps for free in the App Store. Maybe its of more use to advanced students with the accidental calculator, whatever that is, but I doubt it. If youre that advanced, youre probably past the need for note/interval/chord quizzes. At $4 this app is over priced.
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Tenuto