GSDSP MMMm vs ShowMIDI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GSDSP MMMm
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.
- 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
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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 MMMm 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 MMMm 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. MMMm is an AUv3 midi 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
ShowMIDI
This application provides a real-time, glanceable view of all MIDI activity on your computer. It visualizes various MIDI messages and allows you to pause the flow for a data snapshot. It can be used as a standalone tool or an AUv3 plugin within your DAW.
- Real-time MIDI visualization
- Auto-hides irrelevant messages
- Pause and snapshot data
- Standalone application
- AUv3 plugin support
- Supports MPE configuration
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ShowMIDI is an open-source multi-platform GUI application to effortlessly visualize MIDI activity. Instead of wading through logs of MIDI messages to correlate relevant ones and identify what is happening, ShowMIDI visualizes the current activity and auto-hides what you don't care about anymore. It provides you with a real-time glanceable view of all MIDI activity on your computer. ShowMIDI is designed to be always on, using the spacebar or play/pause button you can pause the flow and focus on a data snapshot with the latest state of any MIDI entity. ShowMIDI can be ran as a standalone application that automatically detects all your MIDI devices, or as an AUv3 plugin in your DAW or host to visualize MIDI data in your sessions. ShowMIDI visualizes: * MIDI ports * channels * program change * note on/off * channel pressure * polyphonic pressure * continuous control change * pitchbend * RPN and NRPN * MPE configuration and channel modes ShowMIDI supports: * themes * standalone operation * AUv3 operation
Screenshots
Verdict
GSDSP MMMm and ShowMIDI both sit at 4.9 stars, but that hides the real split: 100% of GSDSP MMMm's written reviews are positive against 88% of ShowMIDI's. On price, rating, ratings volume and update cadence 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.
On the App Store both sit at effectively the same score — 4.9 for GSDSP MMMm against 4.8 for ShowMIDI. Both are backed by a comparable volume of ratings — 14 and 18 respectively. Written reviews are what separate them: 100% of GSDSP MMMm's written reviews are positive against 88% of ShowMIDI's.
GSDSP MMMm ships an update every 6 weeks, ShowMIDI every 2 months. The most recent releases landed on September 11, 2026 and September 5, 2026 respectively.
| Parameter | GSDSP MMMm | ShowMIDI |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (14 ratings) — better | 4.8 (18 ratings) |
| Positive reviews | 100.0% of reviews — better | 87.5% of reviews |
| Number of ratings | 14 | 18 — better |
| Update frequency | Every 6 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 | 12.0 |
| Further details — not scored | ||
| Size | 44 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Gustav Scholda | Uwyn, LLC |
Customer experience
GSDSP MMMm
ShowMIDI
In-app purchases
GSDSP MMMm
No in-app purchases
ShowMIDI
No in-app purchases








