# Theremin I/O vs Wave Organ

The clearest difference is price: Wave Organ at Free against Theremin I/O's $2.99. Wave Organ also leads on rating (5.0 vs 4.0) and in-app purchases (none vs 1). Theremin I/O's advantage is ratings volume (5 vs 1) and iOS requirement (8.0 vs 18.1). On ads and device support there is nothing between them.

Wave Organ is free to download; Theremin I/O costs $2.99 up front. Theremin I/O sells 1 one-off in-app purchase. Wave Organ asks for nothing beyond the download.

Wave Organ holds the better App Store score, 5.0 against 4.0. That said, the two scores are not equally well evidenced: Theremin I/O has 5 ratings behind it against 1, so its average is the more settled of the two.

Theremin I/O ships an update every 24 months, Wave Organ every 2 months. The most recent releases landed on October 26, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Theremin I/O | Wave Organ |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [4.0 (5 ratings)](https://appshunter.io/ios/app/theremin-io/id669456913/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/wave-organ/id6748617734/reviews)** |
| Number of ratings | **5** | 1 |
| Positive reviews | 76.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 24 months | **Every 2 months** |
| Monetization | Paid | **Free** |
| Size | 18 MB | 2 MB |
| Requires iOS | **8.0** | 18.1 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | +4 | 4+ |
| Developer | [FFFF00 Agents AB](https://appshunter.io/developer/288966262) | [Raemond Bergstrom-Wood](https://appshunter.io/developer/1207444822) |

## What reviewers say

### Theremin I/O

[App page](https://appshunter.io/ios/app/theremin-io/id669456913)

Transform your iPhone into a touchless musical instrument using your camera and flash. Control sound generation by hand proximity, with options for scales, sound presets, and effects. An in-app purchase enables MIDI controller functionality.

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

**Features:** macOS Compatibility

**In-app purchases (1)**

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


### Wave Organ

[App page](https://appshunter.io/ios/app/wave-organ/id6748617734)

This app emulates a theremin, allowing you to control tone with one hand and volume with the other by hovering over your phone's screen. Experience unique musical expression through intuitive gesture control.

**Highlights:** Theremin emulation, Tone control via hand gestures, Volume control via hand gestures, Intuitive interface

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Theremin I/O free?

Theremin I/O costs $2.99, and also offers in-app purchases.

### Is Wave Organ free?

Wave Organ is free to download, with no in-app purchases.

### Which has better reviews, Theremin I/O or Wave Organ?

Wave Organ is rated higher. Theremin I/O averages 4.0 out of 5 from 5 ratings, while Wave Organ averages 5.0 from 1 ratings.

### Do Theremin I/O or Wave Organ have ads?

Neither Theremin I/O nor Wave Organ shows ads.

### Which is updated more often, Theremin I/O or Wave Organ?

Theremin I/O ships an update every 24 months, and Wave Organ every 2 months. Most recently, Theremin I/O was updated on October 26, 2026 and Wave Organ on October 8, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*