The great thing about Tempo is that it's a mobile-optimized website with a responsive design. There is no need to download an additional app, and there are no restrictions as to which smart phone / tablets are supported... if you can get on the web you can get Tempo! The website will recognize your device screen dimensions and will optimize the data presentation and navigation.
Simply open your web browser (Safari, Chrome, etc.) and go to
https://tempo.touchtunes.com.
Once you have the website up, you should save it to your home screen via your browsers menu button.