This app is totally offline and can be installed from the Google store. It has all the chords than can be played and all their places on the griff as well as the sound of each chord. You have a menu showing primary chords and after you click one of them, the secondary chords are shown. If you click on a chord that is a button with the picture of that chord, you will hear how the chord sounds like. You can set the speed the chords are strummed, the hand you play with and the difficulty of the chords that are shown. This app has buttons for announcing a bug and for suggesting a feature that the app could have. As simplistic as this app can be it spares all the time you spend counting notes on the griff if you are a beginner or can test your knowledge if you are an advanced player. This app is also not very big and works on current Android versions. The looks of the app are great and no type of player will be confused by the user interface that has large buttons and can be controlled with only one hand. The All Chords app is a really functional app.