# Apollo Sound Injector vs MIDI Expression Control

The clearest difference is rating: MIDI Expression Control at 5.0 against Apollo Sound Injector's 3.5. MIDI Expression Control also leads on review sentiment (100% vs 80%). Apollo Sound Injector's advantage is iOS requirement (7.0 vs 12.0). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

MIDI Expression Control holds the better App Store score, 5.0 against 3.5. Both are backed by a comparable volume of ratings — 8 and 6 respectively. Written reviews point the same way: 80% of Apollo Sound Injector's written reviews are positive against 100% of MIDI Expression Control's.

Apollo Sound Injector ships an update every 5 months, MIDI Expression Control every 6 months. Both last shipped on November 2, 2026.

## The numbers

| Metric | Apollo Sound Injector | MIDI Expression Control |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.5 (8 ratings)](https://appshunter.io/ios/app/apollo-sound-injector-streaming-audio-between-ios-devices/id912136793/reviews) | **[5.0 (6 ratings)](https://appshunter.io/ios/app/midi-expression-control/id1200670783/reviews)** |
| Number of ratings | **8** | 6 |
| Positive reviews | 80.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 6 months |
| Monetization | Free | Free |
| Size | 3 MB | 6 MB |
| Requires iOS | **7.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Patrick Madden](https://appshunter.io/developer/413007812) | [Robert Jonkman](https://appshunter.io/developer/1200670782) |

## What reviewers say

### Apollo Sound Injector

[App page](https://appshunter.io/ios/app/apollo-sound-injector-streaming-audio-between-ios-devices/id912136793)

Stream audio between iOS devices with this app and its companion. It supports Inter-App Audio for integrating synthesizers and sequencers, enabling complex audio processing chains. Designed for musicians, it aims to create a flexible, integrated music studio experience.

**Highlights:** Stream audio between iOS devices, Inter-App Audio support, Integrate synthesizers and sequencers, Build complex audio processing chains, Latency reduction algorithm, Desktop DAW integration

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

**In-app purchases:** none


### MIDI Expression Control

[App page](https://appshunter.io/ios/app/midi-expression-control/id1200670783)

This application allows users to modify settings for MIDI Expression devices. Ensure your device has firmware version 2.6 or higher for iOS compatibility.

**Highlights:** Change device settings, Compatible with MIDI Expression devices, iOS firmware compatibility check, Free to download

**In-app purchases:** none


## Frequently asked questions

### Is Apollo Sound Injector free?

Apollo Sound Injector is free to download, with no in-app purchases.

### Is MIDI Expression Control free?

MIDI Expression Control is free to download, with no in-app purchases.

### Which has better reviews, Apollo Sound Injector or MIDI Expression Control?

MIDI Expression Control is rated higher. Apollo Sound Injector averages 3.5 out of 5 from 8 ratings, while MIDI Expression Control averages 5.0 from 6 ratings.

### Do Apollo Sound Injector or MIDI Expression Control have ads?

Neither Apollo Sound Injector nor MIDI Expression Control shows ads.

### Which is updated more often, Apollo Sound Injector or MIDI Expression Control?

Apollo Sound Injector ships an update every 5 months, and MIDI Expression Control every 6 months. Most recently, Apollo Sound Injector was updated on November 2, 2026 and MIDI Expression Control on November 2, 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.*