Over the last few weeks I've been playing around with building a simple caffeine tracker app for Android app with Scala.js and Tyrian.

It's not super polished, but it was a fun experiment: https://github.com/JD557/coffee-tracker

I also wrote a blog post detailing the experience:

https://blog.joaocosta.eu/articles/8cd240f/writing-an-android-app-with-scalajs