Fold Accordion

As seen on MacRumors. On iPhone Duo, open and close the hinge to work the bellows. Learn mode lights up the keys to play and waits for you. 36 songs and seven sounds.

Featured on MacRumors and iThinkDifferent.

Fold Accordion is an accordion you play on your iPhone. On iPhone Duo, the hinge is the bellows. Open and close the phone to push air, and press the keys on screen to pick the notes.

On other iPhones, swing the phone side to side to pump the bellows. Or pick Touch, and the air flows while you hold a key.

PLAY • Piano keys for the right hand, C4 to G5 • Bass notes F, C, G, D, A, E and chords FM, CM, GM, Dm, Am, Em for the left hand • Play several keys at once • Move faster to play louder • A quick change of direction dips the air, like a real bellows • Pick how you play: Fold, Swing, or Touch

LEARN • 36 public-domain songs, from Ode to Joy to Jingle Bells • Learn mode lights up the key to play. The song waits until you play it. • Start with the melody while the bass plays along. Then turn on Both hands to play the bass and chord buttons too. • Or pick Listen, and the song plays itself while the keys light up • Auto bellows pumps the air for you, so you can focus on the keys

SOUNDS • Seven sounds: Accordion, Button accordion, Italian accordion, Bandoneon, Reed organ, Harmonica, and Reed synth • Accordion and Button accordion are recorded from real accordions • Pick a sound and it plays a short tune

ALSO • Light and dark mode • No network, no account

Pay once. No ads. No subscription. No in-app purchases.

Made for iPhone Duo. Works on iPhone with iOS 26 or later.