Android
Split the Bill is an Android app, written in Scala and published on the Google Play Store (have now removed as I lacked time to keep it maintained).
This app’s not going to win any design or complexity awards, and was more of a successful hobby project to learn Android development and publish an app in a few days.
It’s also a useful example of a Scala Android app. Scala adds wrinkles to the Android setup, as its standard library is so large that it breaks Android’s method limits, and needs to be tree-shaken with Proguard before deploying. Still, I find it a really productive language for Android development when it’s up and running.
The source is on Github.