# MIDI FX vs GSDSP MMM

The clearest difference is in-app purchases: GSDSP MMM at none against MIDI FX's 1. GSDSP MMM also leads on ratings volume (36 vs 5). MIDI FX's advantage is rating (5.0 vs 4.7) and update cadence (every 9 days vs every 5 weeks). On price, ads, monetization model and device support there is nothing between them.

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

MIDI FX holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: GSDSP MMM has 36 ratings behind it against 5, so its average is the more settled of the two.

MIDI FX ships an update every 9 days, GSDSP MMM every 5 weeks. Both last shipped on November 3, 2026.

## The numbers

| Metric | MIDI FX | GSDSP MMM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/midi-fx/id1641511918/reviews)** | [4.7 (36 ratings)](https://appshunter.io/ios/app/gsdsp-mmm/id6443846329/reviews) |
| Number of ratings | 5 | **36** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 5 weeks |
| Monetization | Free | Free |
| Size | 263 MB | 65 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 MMM

[App page](https://appshunter.io/ios/app/gsdsp-mmm/id6443846329)

This app offers a robust MIDI modulation engine for controlling various instruments and plugins. It allows users to create dynamic audio with LFOs, random sources, and more, featuring a performance-focused interface for live use.

**Highlights:** MIDI CC control for plugins and hardware, LFOs, random sources, and envelope followers, Audio-based modulation capabilities, Dedicated Performance Skin for live use, AUv3 audio effect plugin, Desktop versions for Windows and macOS

**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 MMM free?

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

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

MIDI FX is rated higher. MIDI FX averages 5.0 out of 5 from 5 ratings, while GSDSP MMM averages 4.7 from 36 ratings.

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

Neither MIDI FX nor GSDSP MMM shows ads.

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

MIDI FX ships an update every 9 days, and GSDSP MMM every 5 weeks. Most recently, MIDI FX was updated on November 3, 2026 and GSDSP MMM on November 3, 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.*