iPhone Screenshots


Play with light – Theremin I/O turns your iPhone into a touchless music instrument. It uses your camera and flash to measure the distance to your hand, this signal is then processed by a synthesizer to generate a tone.


• Old-school synthesizer
• Constrain input to scales (harmony quantization)
• 8 sound presets with effect controls
• 50+ scale presets
• Use as a MIDI controller (requires in-app purchase)
• Learn fast with the tutorial overlay

For more information visit http://theremin.io

What’s New

Version 1.3

This app has been updated by Apple to use the latest Apple signing certificate.

* Updated for iOS 11
* Network MIDI is now free!

Ratings and Reviews

3.8 out of 5
4 Ratings

4 Ratings

Mr_Strat ,

Sounds good but...

The sound is pretty authentic, but a real theremin isn't zippered.

Squirrelier Dan ,


I have no access to change sounds. The bottom shows up for half a second and then goes blank. Where do I change sounds? Pretty cool how it works though. It’s awesome. Just love to have other sounds.

KDKnopp ,

Awesome simulation!

The GUI is top notch. Way above other apps that try to mimic the theremin.

Very customizable and well worth the small cost.

App Privacy

The developer, FFFF00 Agents AB, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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