Easy to use lite expense tracker using google sheets.
The codebase of HowMuch is mostly written in kotlin and some parts are still in java. The app uses MVP architectural pattern similar to Android Architecture Blueprint for MVP. HowMuch uses rx-java and tries to be reactive as much as possible.
HowMuch's design is highly "Material" and follows not all but many Google's Material Design Specs.
For the latest APK file, check out releases.