We don't have an Android app yet. Actually, we don't quite have an iPhone app yet, either... There have been a number of setbacks during development and we're now running about 6 months behind schedule.
At any rate, we do have a mobile version of the website, which will run as a mobile web app if you save it to your home screen. Mobile web apps are cross-platform, so you can use it on Android, iPhone, Windows phone, or any other modern mobile OS.