# Theremin I/O vs AllGoRhythmics

The clearest difference is price: AllGoRhythmics at Free against Theremin I/O's $2.99. AllGoRhythmics also leads on update cadence (every 9 days vs every 24 months). Theremin I/O's advantage is chart position (#187 vs unranked) and iOS requirement (8.0 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

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

Theremin I/O ships an update every 24 months, AllGoRhythmics every 9 days. The most recent releases landed on October 12, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Theremin I/O | AllGoRhythmics |
| --- | --- | --- |
| 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 9 days** |
| Monetization | Paid | — |
| Best chart rank | **#187** | — |
| Size | 18 MB | 7 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | +4 | 4+ |
| Developer | [FFFF00 Agents AB](https://appshunter.io/developer/288966262) | [PUJA MUZIK PRODUKSIYON ORGANIZASYON TURIZM TICARET LIMITED SIRKETI](https://appshunter.io/developer/1882517446) |

## What reviewers say

### Theremin I/O

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

**Currently charting:** #187 Top Paid · Music (US App Store)

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 |


### AllGoRhythmics

[App page](https://appshunter.io/ios/app/allgorhythmics/id6767700195)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AllGoRhythmics Pro | $3.99 | one-time |


## Frequently asked questions

### Is Theremin I/O free?

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

### Is AllGoRhythmics free?

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

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

Neither Theremin I/O nor AllGoRhythmics shows ads.

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

Theremin I/O ships an update every 24 months, and AllGoRhythmics every 9 days. Most recently, Theremin I/O was updated on October 12, 2026 and AllGoRhythmics on October 7, 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.*