I use Relax Melodies and am pretty happy with it. Theirs isn't interactive though AFAIK.
Edit: I'm not sure what their payment structure is now. Back when I downloaded it you could get unlimited access to everything they made for a flat fee of around $30, which was absolutely worth it. They might have shifted to a subscription model. Still plenty of free content.
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Seconding this. I even noticed that using the app in the morning kept me calmer during the day.
Edit: I'm not sure what their payment structure is now. Back when I downloaded it you could get unlimited access to everything they made for a flat fee of around $30, which was absolutely worth it. They might have shifted to a subscription model. Still plenty of free content.