The e-sword program must be downloaded to your PC. It's free, but some of the resources you might want will cost. It allows you to use traditional, well known resources on your computer without the bulk of traditional books. There is no app for Android devices, but there is one for the iPhone, iPad, etc.; however, the tutorial states that the app is not as functional or powerful as the PC program.
Most of the tutorials for this program are nearly an hour long, but I did find one that was only 5 minutes. I've included the link below. I also included a link that will navigate you to the training menu where you can download the program and learn about some of its specific features. I am unfamiliar with this program, so use it at your own risk. It might be wise to search out consumer reviews to see if the download creates any trouble with computers before you download it to yours.