Terms

Using soundhue is covered by Apple's standard licence agreement for App Store apps. In plain words, a few things it doesn't say:

The subscription

soundhue is free to start. A monthly or yearly subscription opens the rest of Combined and every trainer. Apple bills it and renews it automatically until you cancel; cancel at least 24 hours before the period ends, in your Apple Account settings.

The price

soundhue is still being built, so the price is low. It will rise for new subscribers as the app grows — if you're subscribed, yours stays the same for as long as you stay subscribed.

Refunds

Apple handles refunds, at reportaproblem.apple.com. Your rights under your local consumer law stay yours.