# Holon vs GSDSP MMM

The clearest difference is in-app purchases: GSDSP MMM at none against Holon's 2. GSDSP MMM also leads on rating (4.7 vs 4.5) and update cadence (every 5 weeks vs every 3 months). Holon's advantage is review sentiment (75% vs 67%). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. Holon sells 2 one-off in-app purchases. GSDSP MMM asks for nothing beyond the download.

GSDSP MMM holds the better App Store score, 4.7 against 4.5. Both are backed by a comparable volume of ratings — 14 and 36 respectively. Written reviews complicate that: 75% of Holon's written reviews are positive against 67% of GSDSP MMM's, so the app with the better star average is not the one people write more warmly about.

Holon ships an update every 3 months, GSDSP MMM every 5 weeks. The most recent releases landed on October 19, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Holon | GSDSP MMM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (14 ratings)](https://appshunter.io/ios/app/holon/id1352687747/reviews) | **[4.7 (36 ratings)](https://appshunter.io/ios/app/gsdsp-mmm/id6443846329/reviews)** |
| Number of ratings | 14 | **36** |
| Positive reviews | **75.0% of reviews** | 66.7% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 weeks** |
| Monetization | Paid | **Free** |
| Size | 144 MB | 65 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Holonic Systems Oy](https://appshunter.io/developer/1172474856) | [Gustav Scholda](https://appshunter.io/developer/1642323227) |

## What reviewers say

### Holon

[App page](https://appshunter.io/ios/app/holon/id1352687747)

This app transforms your movement through cities into a dynamic, real-time musical score. It uses your physical location and activity to generate interactive synth music, encouraging outdoor exploration and turning listeners into performers.

**Highlights:** Human-powered music generation, Encourages outdoor activity, Zero UI for minimal distraction, Environmentally responsive music, Real-time synth music creation, Optional AirPods and Apple Watch integration

**Features:** Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Apple Watch support | Free | one-time |
| Movesense Support | Free | 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 Holon free?

Holon 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, Holon or GSDSP MMM?

GSDSP MMM is rated higher. Holon averages 4.5 out of 5 from 14 ratings, while GSDSP MMM averages 4.7 from 36 ratings.

### Do Holon or GSDSP MMM have ads?

Neither Holon nor GSDSP MMM shows ads.

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

Holon ships an update every 3 months, and GSDSP MMM every 5 weeks. Most recently, Holon was updated on October 19, 2026 and GSDSP MMM 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.*