# Theremin I/O vs Chorus D

The clearest difference is rating: Chorus D at 5.0 against Theremin I/O's 4.0. Chorus D also leads on in-app purchases (none vs 1) and review sentiment (100% vs 77%). Theremin I/O's advantage is price ($2.99 vs $5.99) and chart position (#187 vs unranked). On ratings volume, ads, monetization model and device support there is nothing between them.

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

Chorus D holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 5 and 6 respectively. Written reviews point the same way: 77% of Theremin I/O's written reviews are positive against 100% of Chorus D's.

Theremin I/O ships an update every 24 months, Chorus D every 7 months. Both last shipped on October 12, 2026.

## The numbers

| Metric | Theremin I/O | Chorus D |
| --- | --- | --- |
| Price | **$2.99** | $5.99 |
| Rating | [4.0 (5 ratings)](https://appshunter.io/ios/app/theremin-io/id669456913/reviews) | **[5.0 (6 ratings)](https://appshunter.io/ios/app/chorus-d/id1499061277/reviews)** |
| Number of ratings | 5 | **6** |
| Positive reviews | 76.9% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 24 months | **Every 7 months** |
| Monetization | Paid | Paid |
| Best chart rank | **#187** | — |
| Size | 18 MB | 11 MB |
| Requires iOS | **8.0** | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | +4 | 4+ |
| Developer | [FFFF00 Agents AB](https://appshunter.io/developer/288966262) | [Blue Mangoo Consulting Company Limited](https://appshunter.io/developer/1475107602) |

## 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 |


### Chorus D

[App page](https://appshunter.io/ios/app/chorus-d/id1499061277)

This audio unit effect emulates a classic chorus stomp-box with a unique, subtle sound. It offers a wider stereo image and thicker sound without the typical pitch-wavy artifacts. Its simplified interface provides a range of tasteful tones.

**Highlights:** Subtle stereo pitch-shifting, Constant pitch-shift amounts, Stereo image widening, Sound thickening, Six tasteful presets, Unique sound profile

**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 Chorus D free?

Chorus D costs $5.99, with no in-app purchases.

### Which has better reviews, Theremin I/O or Chorus D?

Chorus D is rated higher. Theremin I/O averages 4.0 out of 5 from 5 ratings, while Chorus D averages 5.0 from 6 ratings.

### Do Theremin I/O or Chorus D have ads?

Neither Theremin I/O nor Chorus D shows ads.

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

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