# MIDI FX vs GSDSP MMMm

The clearest difference is in-app purchases: GSDSP MMMm at none against MIDI FX's 1. GSDSP MMMm also leads on ratings volume (16 vs 5). MIDI FX's advantage is update cadence (every 9 days vs every 5 weeks). On price, rating, ads and monetization model there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for MIDI FX against 4.9 for GSDSP MMMm. Both are backed by a comparable volume of ratings — 5 and 16 respectively.

MIDI FX ships an update every 9 days, GSDSP MMMm every 5 weeks. The most recent releases landed on October 23, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | MIDI FX | GSDSP MMMm |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/midi-fx/id1641511918/reviews)** | [4.9 (16 ratings)](https://appshunter.io/ios/app/gsdsp-mmmm/id6450306205/reviews) |
| Number of ratings | 5 | **16** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 5 weeks |
| Monetization | Free | Free |
| Size | 263 MB | 44 MB |
| Requires iOS | 14.7 | **13.0** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jorge Arroyo](https://appshunter.io/developer/548989572) | [Gustav Scholda](https://appshunter.io/developer/1642323227) |

## What reviewers say

### 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 |


### GSDSP MMMm

[App page](https://appshunter.io/ios/app/gsdsp-mmmm/id6450306205)

This app provides a powerful MIDI modulation engine to control various plugins, hardware, and instruments. It offers a range of modulation sources like LFOs and random generators, and includes a dedicated performance skin for live use. It's a MIDI-only FX version for hosts requiring pure MIDI processing.

**Highlights:** MIDI CC control for plugins and hardware, LFO, Random, Envelope Follower modulators, XY pads for modulation, Dedicated Performance Skin for live use, AUv3 MIDI FX plugin, Desktop versions available

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

**In-app purchases:** none


## Frequently asked questions

### Is MIDI FX free?

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

### Is GSDSP MMMm free?

GSDSP MMMm is free to download, with no in-app purchases.

### Which has better reviews, MIDI FX or GSDSP MMMm?

MIDI FX is rated higher. MIDI FX averages 5.0 out of 5 from 5 ratings, while GSDSP MMMm averages 4.9 from 16 ratings.

### Do MIDI FX or GSDSP MMMm have ads?

Neither MIDI FX nor GSDSP MMMm shows ads.

### Which is updated more often, MIDI FX or GSDSP MMMm?

MIDI FX ships an update every 9 days, and GSDSP MMMm every 5 weeks. Most recently, MIDI FX was updated on October 23, 2026 and GSDSP MMMm on October 27, 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.*