# Theremin I/O — Touchless music instrument

> Touchless music instrument app using camera and flash for sound generation. (iPhone/iPad app by FFFF00 Agents AB.)

- Source: https://appshunter.io/ios/app/theremin-io/id669456913 (this page in markdown: same URL + `.md`)
- Developer: [FFFF00 Agents AB](https://appshunter.io/developer/288966262)
- Category: Music, Entertainment
- Price: $2.99 with in-app purchases
- Rating: 4.00/5 from 5 App Store ratings · 13 written reviews indexed
- Age rating: +4
- Requires: iOS 8.0 · 18 MB
- Languages: American English
- Released: 2013-11-06
- Data updated: 2026-08-17
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/theremin-io/id669456913/reviews.md

## What is Theremin I/O?

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.

Features:

  • 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

## Key features

- Touchless instrument control via camera
- Adjustable scales and harmony quantization
- Multiple sound presets with effects
- MIDI controller functionality (in-app purchase)
- Interactive tutorial overlay

## Pricing and in-app purchases

Base price: $2.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Network MIDI | $5.99 | one-time |


## Recent user reviews (10 of 13)

All indexed reviews: https://appshunter.io/ios/app/theremin-io/id669456913/reviews.md

### 3/5 — Sounds

*2018-10-29*

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.

### 5/5 — AWSOME!!!

*2016-10-19*

This tool for making sound is truly fantastic!

I have used it in the recording studio and even used it on stage!
You just need to download it, experiment and fun!  That's all I can say! If your looking for a really cool, responsive and versatile instrument on your phone...look no further!
Enjoy!!!

### 4/5 — Super !

*2016-04-01*

J'avoue que c'est quand même un super gadget qui permet d'émuler cet instrument de musique très étrange. On retrouve effectivement les sonorités mais il manque quand même un contrôle car le terremin d'origine utilise deux antennes. Mais c'est quand même bien fun de créer des sons sans toucher le téléphone

### 5/5 — Awesome simulation!

*2015-10-31*

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

Very customizable and well worth the small cost.

### 1/5 — Issue with calibration

*2014-10-01*

I checked, and my phone allows this app to use the camera, but it could never calibrate.

**Developer response:** Hi, I know this is several years late but Apple just started allowing Developers to respond to reviews. If you still need help with the app send me an email at johan@yellowagents.com and I'll do my best to assist you!

### 5/5 — Fun Fun Fun

*2014-04-28*

Too cool try it !

### 5/5 — Bellissima

*2014-02-23, version 1.0*

Un vero theremin

### 5/5 — Cool gestures

*2014-01-31*

It's a fun little app to experiment with camera gestures like air vox

### 5/5 — Very, very cool.

*2013-12-09*

Not only is it sensitive to your hand motions, but it calibrates well for light conditions. Also, lots of voices and harmonic settings. Very nicely done.

### 4/5 — Sounds good but...

*2013-11-19*

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

## Frequently asked questions about Theremin I/O

### What is Theremin I/O?

Theremin I/O is a music application that turns your iPhone into a touchless instrument. It utilizes the device's camera and flash to detect hand proximity, which then controls a synthesizer to produce sound.

### How does Theremin I/O work?

The app uses your iPhone's camera and flash to measure the distance of your hand. This signal is processed by an internal synthesizer to generate musical tones, allowing for touchless performance.

### Can I use Theremin I/O as a MIDI controller?

Yes, Theremin I/O can be used as a MIDI controller. This feature requires an in-app purchase to unlock its functionality.

### Does Theremin I/O have ads?

No, Theremin I/O does not contain advertisements. It is a paid application with an optional in-app purchase for MIDI controller functionality.

### What devices does Theremin I/O support?

Theremin I/O is designed for iPhone and iPod touch devices. It is compatible with iOS operating systems.

### How often is Theremin I/O updated?

The latest version of Theremin I/O is 1.3, last updated on September 27, 2017. While updates have not been frequent recently, the app has been stable since its release in 2013.

### What is the price of Theremin I/O?

Theremin I/O is available for purchase at $2.99. There is an additional in-app purchase required to enable its MIDI controller capabilities.

### What age rating does Theremin I/O have?

Theremin I/O has an age rating of 4+. This indicates it is suitable for users of all ages, with no mature content.

## Version history (last 3 releases)

### 1.3 — 2017-09-27

This update from Apple will improve the functionality of this app. No new features are included.

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

### 1.1 — 2014-10-20

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.

### 1.0 — 2013-11-02

No release notes.

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## More apps by FFFF00 Agents AB

- [Seismometer](https://appshunter.io/ios/app/seismometer/id288966259)
- [Laundry Care](https://appshunter.io/ios/app/laundry-care/id353435242)

All apps by FFFF00 Agents AB: https://appshunter.io/developer/288966262

## Related topics

[ffff00 agents ab](https://appshunter.io/ios/topics/ffff00-agents-ab) · [theremin plus](https://appshunter.io/ios/topics/theremin-plus) · [theremin touch](https://appshunter.io/ios/topics/theremin-touch)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-17.*