MIDISpy vs GSDSP MMM
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MIDISpy
This utility helps monitor MIDI connections across various platforms. It offers basic filtering for different MIDI message types and supports multiple connectivity options.
- Standalone and AUv3 support
- Basic message filtering
- Inter-App MIDI
- USB MIDI
- Bluetooth MIDI
- Network MIDI
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MIDISpy - MIDI Monitor A handy little utility for monitoring MIDI connectivity. Overview: - Standalone and AUv3 support - Basic Filters for Note, Control Change, Clock and SysEx messages Connectivity: - Inter-App MIDI - USB MIDI - Bluetooth MIDI - Network MIDI - AUv3 Requirements: - iOS9+
GSDSP MMM
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.
- 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
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A powerful MIDI modulation engine for controlling plugins, hardware, and instruments using LFOs, random sources, macros, and audio-based modulation. Modulate Everything MMM is a MIDI controller and modulation workstation designed to control any parameter that accepts MIDI CC — software instruments, plugins, external hardware, or any MIDI-capable device. Create modulation using LFOs, Random Generators, Envelope Followers, XY pads, and more. No more drawing of automation curves, keep your audio dynamic and exciting with ease. Perform Live MMM includes a dedicated Performance Skin designed for low-light and stage environments. It uses a restrained, red-accented color palette that preserves focus and minimizes visual distraction while performing. The interface remains clear and readable in dark settings, ensuring stable workflow during your live performance. MMM vs MMMm MMM includes audio input, enabling Envelope Followers, audio-reactive modulation, and audio output — ideal when used as an audio plugin. MMMm, by contrast, is a MIDI-only FX version for hosts such as Logic Pro or AUM that require a pure MIDI processor. Both versions support MIDI input and output and provide the same core modulators. MMM is an AUv3 audio effect plugin compatible with Logic Pro, AUM, Cubasis, GarageBand and many more. A Desktop version is also available for Windows and macOS (VST3 / AU / AAX). More information here: https://gs-dsp.com/products So what are you waiting for?
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | MIDISpy | GSDSP MMM |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (4 ratings) | 4.8 (34 ratings) — better |
| Positive reviews | 71.4% of reviews | 75.0% of reviews — better |
| Number of ratings | 4 | 34 — better |
| Update frequency | Every 3 weeks — better | Every 6 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 11.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 6 MB | 65 MB |
| Age rating | 4+ | 4+ |
| Developer | Kai Aras | Gustav Scholda |
Customer experience
MIDISpy
GSDSP MMM
In-app purchases
MIDISpy
No in-app purchases
GSDSP MMM
No in-app purchases









