You can open this "All Piano Chords" in a new window, so it will fit the full window size of your device.
Select a root (C,D,E...) on the top left and a chord (Major, minor, 7...) on the right to view the notes, listen to the tetrachord and see the keys on the keyboard.
'All Piano Chords online' is a JavaScript app and should work fine with almost all devices. If you encounter any problems, or if you have an idea to enhance this game - or even an idea for a new game - I would be happy if you get in contact with me.