Cross platform support

The app is only available on Android, and that's a pity. Things that I would like:

1. An iOS app.
2. A static website where it can be tried in a browser without installing, making it available to all platforms. Performance might be an issue here. Saving drawings and making GIFs would not be available.
3. Sharing code between different platforms. If performance is acceptable then the apps and website might all be implemented in Javascript (or a language that transpiles to it) using something like React Native or Cordova. Alternatively the Kotlin code could be targeted at Javascript so nothing about the Android app would change but the website and maybe even the iOS app could reuse the Kotlin code.

This is of course a huge undertaking, for now I'd just like to hear if anyone has ideas or is interested.