Cifra Club is a digital guitar teacher that you can always keep with you on your Android. The app is in Portuguese, but that shouldn't keep you from accessing all the tabs within its interface.
Additionally, Cifra Club allows you to quickly access dozens of online video lessons that you can simultaneously watch while you read the tabs.
Cifra Club is a great app for learning how to play guitar, with an enormous amount of free content. It doesn't matter which style is your favorite, you'll find all kinds of music within this app.
