Syntheremin is a touch-free music instrument controlled by hand movement in front of an iPhone’s TrueDepth camera. Move one hand through a pitch field to glide across notes, and use the other to control volume. Wrist rotation adjusts tone and echo, while fingertip gestures add layered harmonies. Classic, Choir, and Glass synth characters, scale-based note guidance, a tuner, live pitch lanes, and left- or right-handed layouts support experimentation. The developer says camera frames and hand landmarks are processed on the phone and never saved or uploaded, but the bundled Google MediaPipe SDK sends limited usage and performance metrics to Google. Syntheremin is free, requires iOS 17 or later, and needs an iPhone with a front TrueDepth camera such as the hardware used by Face ID. It is designed for live performance, not a multitrack recording studio.
