# Air Melody vs Theremin I/O

The clearest difference is rating: Theremin I/O at 4.0 against Air Melody's 1.0. Theremin I/O also leads on review sentiment (77% vs 60%) and ratings volume (5 vs 1). Air Melody's advantage is in-app purchases (none vs 1) and update cadence (every 3 months vs every 24 months). On ads, monetization model and device support there is nothing between them.

Air Melody costs $1.99 and Theremin I/O $2.99 up front. Theremin I/O sells 1 one-off in-app purchase. Air Melody asks for nothing beyond the download.

Theremin I/O holds the better App Store score, 4.0 against 1.0. 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. Written reviews point the same way: 60% of Air Melody's written reviews are positive against 77% of Theremin I/O's.

Air Melody ships an update every 3 months, Theremin I/O every 24 months. The most recent releases landed on October 23, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Air Melody | Theremin I/O |
| --- | --- | --- |
| Price | **$1.99** | $2.99 |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/air-melody/id374534002/reviews) | **[4.0 (5 ratings)](https://appshunter.io/ios/app/theremin-io/id669456913/reviews)** |
| Number of ratings | 1 | **5** |
| Positive reviews | 60.0% of reviews | **76.9% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 24 months |
| Monetization | Paid | Paid |
| Size | 9 MB | 18 MB |
| Requires iOS | 12.0 | **8.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | +4 | +4 |
| Developer | [Masao Suzaki](https://appshunter.io/developer/374534005) | [FFFF00 Agents AB](https://appshunter.io/developer/288966262) |

## What reviewers say

### Air Melody

[App page](https://appshunter.io/ios/app/air-melody/id374534002)

This app allows users to create music using their device's motion and on-screen controls. Explore various tones and effects to craft unique melodies. It offers intuitive pitch and dynamics manipulation for a creative musical experience.

**Highlights:** Motion-based pitch and dynamics control, Multiple instrument tones, Adjustable echo effects, Pitch correction options, On-screen wheel for octave control

**Features:** Vision Pro support

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Air Melody free?

Air Melody costs $1.99, with no in-app purchases.

### Is Theremin I/O free?

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

### Which has better reviews, Air Melody or Theremin I/O?

Theremin I/O is rated higher. Air Melody averages 1.0 out of 5 from 1 ratings, while Theremin I/O averages 4.0 from 5 ratings.

### Do Air Melody or Theremin I/O have ads?

Neither Air Melody nor Theremin I/O shows ads.

### Which is updated more often, Air Melody or Theremin I/O?

Air Melody ships an update every 3 months, and Theremin I/O every 24 months. Most recently, Air Melody was updated on October 23, 2026 and Theremin I/O on October 26, 2026.

---

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