Search by song or artist, or paste a link to a chord sheet. Vision Sound reads the chords, works out the key, and shows you the hand shape for each one, advancing as you play it. You can change the key afterwards and the whole song follows.
Open the song on one of these, then copy the address from your browser and paste it above.
Try
Tilt your wrist inward for major, outward for minor.
Vision Sound is built on Gesture Synth by Eric Wei, used under license — thank you, Eric — original video tutorial.