# Motion Synth vs MIDI FX

The clearest difference is rating: MIDI FX at 5.0 against Motion Synth's 3.5. MIDI FX also leads on update cadence (every 9 days vs every 4 months) and device support (4 vs 2). Motion Synth's advantage is in-app purchases (none vs 1) and ratings volume (40 vs 4). On price, ads and monetization model there is nothing between them.

Both are free to download. MIDI FX sells 1 one-off in-app purchase. Motion Synth asks for nothing beyond the download.

MIDI FX holds the better App Store score, 5.0 against 3.5. That said, the two scores are not equally well evidenced: Motion Synth has 40 ratings behind it against 4, so its average is the more settled of the two.

Motion Synth ships an update every 4 months, MIDI FX every 9 days. The most recent releases landed on October 13, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Motion Synth | MIDI FX |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.5 (40 ratings)](https://appshunter.io/ios/app/motion-synth/id945266624/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/midi-fx/id1641511918/reviews)** |
| Number of ratings | **40** | 4 |
| Positive reviews | 73.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 9 days** |
| Monetization | Free | Free |
| Size | 48 MB | 263 MB |
| Requires iOS | **9.0** | 14.7 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [AUUG](https://appshunter.io/developer/945266623) | [Jorge Arroyo](https://appshunter.io/developer/548989572) |

## What reviewers say

### Motion Synth

[App page](https://appshunter.io/ios/app/motion-synth/id945266624)

This app turns your iPhone or iPod touch into a musical instrument. Play notes with touch and control sound with motion. It can be used standalone, with other iOS music apps, or even external hardware and laptop software.

**Highlights:** Play notes via touch, Shape sound through motion, Control in-app sounds, Control other iOS music apps, Control external hardware synths, Control laptop audio/visual software

**Features:** macOS Compatibility

**In-app purchases:** none


### MIDI FX

[App page](https://appshunter.io/ios/app/midi-fx/id1641511918)

This app allows you to control and process MIDI signals for music creation. It offers features like harmonization, transposition, and sequencing, enabling you to control external or virtual synthesizers and create complex musical arrangements.

**Highlights:** MIDI signal processing, Harmonize and Transpose, Sequencer for synths, Delay and Looper, Filter notes by velocity, Internal instruments

**Features:** Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock app | $9.99 | one-time |


## Frequently asked questions

### Is Motion Synth free?

Motion Synth is free to download, with no in-app purchases.

### Is MIDI FX free?

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

### Which has better reviews, Motion Synth or MIDI FX?

MIDI FX is rated higher. Motion Synth averages 3.5 out of 5 from 40 ratings, while MIDI FX averages 5.0 from 4 ratings.

### Do Motion Synth or MIDI FX have ads?

Neither Motion Synth nor MIDI FX shows ads.

### Which is updated more often, Motion Synth or MIDI FX?

Motion Synth ships an update every 4 months, and MIDI FX every 9 days. Most recently, Motion Synth was updated on October 13, 2026 and MIDI FX on October 6, 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.*