# Theremin I/O vs Motio

The clearest difference is price: Motio at Free against Theremin I/O's $2.99. Motio also leads on update cadence (every 2 weeks vs every 24 months). Theremin I/O's advantage is iOS requirement (8.0 vs 26.0). On ads, in-app purchases and device support there is nothing between them.

Motio is free to download; Theremin I/O costs $2.99 up front. Theremin I/O sells 1 one-off in-app purchase and Motio sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

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

## The numbers

| Metric | Theremin I/O | Motio |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[4.0 (5 ratings)](https://appshunter.io/ios/app/theremin-io/id669456913/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 76.9% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 24 months | **Every 2 weeks** |
| Monetization | Paid | — |
| Size | 18 MB | 10 MB |
| Requires iOS | **8.0** | 26.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | +4 | 4+ |
| Developer | [FFFF00 Agents AB](https://appshunter.io/developer/288966262) | [Danis Gaiazov](https://appshunter.io/developer/1798511426) |

## 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 |


### Motio

[App page](https://appshunter.io/ios/app/motio-motion-synth/id6760047575)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Motio Pro | $2.99 | per month |
| Motio Pro | $19.99 | per year |


## Frequently asked questions

### Is Theremin I/O free?

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

### Is Motio free?

Motio is free to download, with in-app purchases available.

### Do Theremin I/O or Motio have ads?

Neither Theremin I/O nor Motio shows ads.

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

Theremin I/O ships an update every 24 months, and Motio every 2 weeks. Most recently, Theremin I/O was updated on October 26, 2026 and Motio 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.*