# MIDISpy vs GSDSP MMM

The clearest difference is rating: GSDSP MMM at 4.8 against MIDISpy's 4.0. GSDSP MMM also leads on ratings volume (34 vs 4) and device support (3 vs 1). On price, review sentiment, 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.

GSDSP MMM holds the better App Store score, 4.8 against 4.0. That said, the two scores are not equally well evidenced: GSDSP MMM has 34 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 71% of MIDISpy's written reviews are positive against 75% of GSDSP MMM's.

MIDISpy ships an update every 3 weeks, GSDSP MMM every 6 weeks. The most recent releases landed on September 30, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | MIDISpy | GSDSP MMM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (4 ratings)](https://appshunter.io/ios/app/midispy/id1444652196/reviews) | **[4.8 (34 ratings)](https://appshunter.io/ios/app/gsdsp-mmm/id6443846329/reviews)** |
| Number of ratings | 4 | **34** |
| Positive reviews | 71.4% of reviews | **75.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 6 weeks |
| Monetization | Free | Free |
| Size | 6 MB | 65 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Kai Aras](https://appshunter.io/developer/370820899) | [Gustav Scholda](https://appshunter.io/developer/1642323227) |

## What reviewers say

### MIDISpy

[App page](https://appshunter.io/ios/app/midispy/id1444652196)

This utility helps monitor MIDI connections across various platforms. It offers basic filtering for different MIDI message types and supports multiple connectivity options.

**Highlights:** Standalone and AUv3 support, Basic message filtering, Inter-App MIDI, USB MIDI, Bluetooth MIDI, Network MIDI

**Features:** macOS Compatibility

**In-app purchases:** none


### 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

**In-app purchases:** none


## Frequently asked questions

### Is MIDISpy free?

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

### Is GSDSP MMM free?

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

### Which has better reviews, MIDISpy or GSDSP MMM?

GSDSP MMM is rated higher. MIDISpy averages 4.0 out of 5 from 4 ratings, while GSDSP MMM averages 4.8 from 34 ratings.

### Do MIDISpy or GSDSP MMM have ads?

Neither MIDISpy nor GSDSP MMM shows ads.

### Which is updated more often, MIDISpy or GSDSP MMM?

MIDISpy ships an update every 3 weeks, and GSDSP MMM every 6 weeks. Most recently, MIDISpy was updated on September 30, 2026 and GSDSP MMM on September 17, 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.*