Play with light

Theremin I/O turns your iPhone into a touchless music instrument.

Camera + Flash

Theremin uses your iPhone's camera and flash to measure light reflected off your hand. This signal is then passed in to the synthesizer, creating a tone.

Sound Effects

Theremin ships with 8 sound presets. Each preset has effect controls allowing you to create many unique sounds!

Never miss a note

Playing a theremin can be hard – that's why we bundle a harmony quantizer that snaps the frequency to a note. Create your own scale or select one from the many presets.

For the professional

By purchasing the MIDI upgrade you can use Theremin I/O as a digital controller. Send notes or control change signals to your favourite music software!