Foldeon: Diatonic Accordion

Foldeon turns your iPhone into a diatonic button accordion — and on iPhone Duo, the hinge itself becomes the bellows. Unfold the phone and fold it again: the air moves and the reeds sing. Stop, and the sound stops, just like a real squeezebox. And like every diatonic accordion, opening and closing play different notes on the same key, so a scale runs back and forth with the bellows. On any other iPhone, tilt the phone toward you and away to work the bellows, or drag the bellows on screen. WHAT MAKES IT FEEL REAL • Bellows pressure sets loudness and tone together: a gentle push is soft and dark, a firm one bright and full. • Free-reed sound with the breath of the valves, synthesized on your iPhone — no recorded samples. • Push and pull notes on every key, laid out like the real instruments. • Calibrated to you: a short warm-up learns how you move and how still your phone's sensor is. INSTRUMENTS • Easy Accordion in G — free: eight big keys and four basses, two octaves of G major. • With Pro: Cajun Accordion in C, Melodeon D/G, Two-Row G/C, Norteño G/C/F with 38 keys, and the 20-key Anglo Concertina C/G. REGISTERS Clarinet and Violin are free. Pro adds Bassoon, Bandoneón, Musette and Master. SHARE YOUR PLAYING Record up to a minute and Foldeon makes a vertical video with the bellows moving the way you played — ready for TikTok, Reels and Shorts. Free videos carry a small "Played on Foldeon" mark; Pro removes it. NOTE NAMES YOUR WAY C D E, Do Re Mi, or the German H. FOLDEON PRO One purchase, no subscription: five more instruments, four more registers, and videos without the watermark. PRIVATE BY DESIGN No account, no ads, no tracking. Your recordings stay on your iPhone until you share them. Foldeon never uses the microphone.