[Smudge]

We built it for iOS, but I expect Android would have been a similar experience (albeit with much more cross-device testing required).

Hard to say how much of it was platform-specific, since we only targeted 1 platform (for now). But the large majority of the code we wrote exists in React components or in related JS files, so porting it over to Android should be a matter of decoupling the parts of the code that rely on native features (i.e. camera, navigation, etc).

A lot of that work is already happening in the React Native community so I expect the cross-platform support will keep getting easier.