A free app for Android, by Skrivarna Software.

Rude – Drum Rudiment Training is a free app that provides access to a wide range of different exercises and techniques for practicing the drums. If you want to improve your skills as a drummer, this is the app for you. It contains a lot of different exercises and techniques that can help you achieve your desired results. It is very easy to use and understand, so you will not have to worry about how to use it or what it does.

It is a very useful app and a must for anyone who wants to learn how to play the drums. It will help you improve your skills and learn new techniques.