Thanks a lot! Yeah, when I had the idea for the circle of fifths keyboard, I knew I just had to build it because it has so many benefits compared to the naive approach, especially when thinking "harmonically".

Yes, there are plans for an iOS version! Godot has native support for iOS, so it should be pretty much plug-and-play. I haven't done it yet because of the developer fee that Apple charges, and because I am mainly an Android user myself. If there is enough interest though, I'm sure my partner would let me borrow her Macbook & iPad in order to bring this out though :)