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Theremin I/O

By FFFF00 Agents AB

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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

What's New in Version 1.1

Now works in iOS 8!

Other stuff: Option to use new high fps video modes for reduced latency, tweak a couple of sound presets, improved light detection algorithm.

iPhone Screenshots

iPhone Screenshot 1
iPhone Screenshot 2
iPhone Screenshot 3

Customer Reviews

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.

Theremin I/O
View in iTunes
  • $2.99
  • Category: Music
  • Updated:
  • Version: 1.1
  • Size: 16.2 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 6.1 or later. Compatible with iPhone 4, iPhone 4s, iPhone 5, iPhone 5c, iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPhone SE, iPhone 7, iPhone 7 Plus, 9.7-inch iPad Pro, 9.7-inch iPad Pro Wi-Fi + Cellular, iPod touch (5th generation), and iPod touch (6th generation).

Customer Ratings

We have not received enough ratings to display an average for the current version of this application.
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Top In-App Purchases

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