# Theremin I/O vs Pixel Music

The clearest difference is rating: Pixel Music at 4.6 against Theremin I/O's 4.0. Pixel Music also leads on in-app purchases (none vs 1) and update cadence (every 8 months vs every 24 months). Theremin I/O's advantage is price ($2.99 vs $5.99) and iOS requirement (8.0 vs 13.0). On review sentiment, ratings volume, ads and monetization model there is nothing between them.

Theremin I/O costs $2.99 and Pixel Music $5.99 up front. Theremin I/O sells 1 one-off in-app purchase. Pixel Music asks for nothing beyond the download.

Pixel Music holds the better App Store score, 4.6 against 4.0. Both are backed by a comparable volume of ratings — 5 and 7 respectively. Written reviews point the same way: 77% of Theremin I/O's written reviews are positive against 82% of Pixel Music's.

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

## The numbers

| Metric | Theremin I/O | Pixel Music |
| --- | --- | --- |
| Price | **$2.99** | $5.99 |
| Rating | [4.0 (5 ratings)](https://appshunter.io/ios/app/theremin-io/id669456913/reviews) | **[4.6 (7 ratings)](https://appshunter.io/ios/app/pixel-music/id1383899232/reviews)** |
| Number of ratings | 5 | **7** |
| Positive reviews | 76.9% of reviews | **81.8% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 24 months | **Every 8 months** |
| Monetization | Paid | Paid |
| Size | 18 MB | 39 MB |
| Requires iOS | **8.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | +4 | 4+ |
| Developer | [FFFF00 Agents AB](https://appshunter.io/developer/288966262) | [Andrei Antonescu](https://appshunter.io/developer/1126352058) |

## 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 |


### Pixel Music

[App page](https://appshunter.io/ios/app/pixel-music/id1383899232)

Transform your favorite images into unique musical compositions. This app uses pixel data to control pitch, duration, and velocity, allowing you to create melodies and rhythms by interacting with visuals. Explore various traversal methods and image data types for diverse sonic results.

**Highlights:** Pixels control pitch, velocity, and note duration, Play multiple images simultaneously, AUv3 support with MIDI, Ableton Link compatible, Customizable image traversal and data mapping, Internal synth with effects, Save and load app states

**Features:** macOS Compatibility, Vision Pro support

**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 Pixel Music free?

Pixel Music costs $5.99, with no in-app purchases.

### Which has better reviews, Theremin I/O or Pixel Music?

Pixel Music is rated higher. Theremin I/O averages 4.0 out of 5 from 5 ratings, while Pixel Music averages 4.6 from 7 ratings.

### Do Theremin I/O or Pixel Music have ads?

Neither Theremin I/O nor Pixel Music shows ads.

### Which is updated more often, Theremin I/O or Pixel Music?

Theremin I/O ships an update every 24 months, and Pixel Music every 8 months. Most recently, Theremin I/O was updated on October 26, 2026 and Pixel Music on October 24, 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.*