
FoldTune
Accordion for foldable phones
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Free
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About
Your phone folds. So does an accordion.
FoldTune turns iPhone Duo into a squeezebox. Hold it like a book, pump the hinge open and closed, and the bellows breathe: press harder and faster for a louder, brighter sound, ease off for a whisper. Bass and chord buttons sit under your left hand, piano keys under your right, just like the real thing.
PUMP THE HINGE
• Opening and closing the fold is your bellows. Both directions sound, with a natural dip when you change direction
• Bass notes plus major and minor chords on the left, in circle-of-fifths order
• A vertical piano keyboard on the right, with octave shift
ANY IPHONE, ANY SCREEN
• On the outer screen and on every other iPhone, hold the breathe bar under your thumb. Slide up to push harder
• Or rock the phone to breathe
• Bigger keys on the small screen, two-hand layout on the big one
TWO VOICES
• Accordion: three reeds per note with that warm musette shimmer
• Harmonium: darker and softer, with a drone
MADE ON YOUR PHONE
• Every sound is synthesised live on your device. No samples, no downloads
• No account, no ads, no tracking. We collect nothing
FREE
FoldTune is free. No subscriptions, no purchases.
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What's New in FoldTune
1.0
October 22, 2026

