This is a book of guitar chords, and you can check the sound as well !
Use this app to improve your guitar practice♪

12 keys×21 chords are included.
Also, it includes 3 types of each positions (how to press down), so there are 756 kinds of guitar chord diagrams.

You can check the sound by tapping and sliding gut.
（※By tapping ☆ at the lower left of the screen, it'll automatically check the stroke tone.）