# Soi vs MES Arpeggiator

The clearest difference is price: Soi at Free against MES Arpeggiator's $14.99. Soi also leads on iOS requirement (10.3 vs 12.0). MES Arpeggiator's advantage is rating (5.0 vs 4.0). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.

Soi is free to download; MES Arpeggiator costs $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

MES Arpeggiator holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 1, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Soi | MES Arpeggiator |
| --- | --- | --- |
| Price | **Free** | $14.99 |
| Rating | [4.0 (2 ratings)](https://appshunter.io/ios/app/soi/id986051970/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/mes-arpeggiator/id6758674634/reviews)** |
| Number of ratings | **2** | 1 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | **Free** | Paid |
| Size | 28 MB | 32 MB |
| Requires iOS | **10.3** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Aero Deko](https://appshunter.io/developer/507882387) | [Make Electronic Sound OU](https://appshunter.io/developer/1874343004) |

## What reviewers say

### Soi

[App page](https://appshunter.io/ios/app/soi/id986051970)

Create and improvise music with others in real-time. This expressive instrument allows groups of any size to perform together, automatically harmonizing and synchronizing participants for an engaging experience where there are no wrong notes.

**Highlights:** Real-time music creation, Group improvisation, Automatic harmonization, Participant synchronization, Ensemble performance

**In-app purchases:** none


### MES Arpeggiator

[App page](https://appshunter.io/ios/app/mes-arpeggiator/id6758674634)

Generate evolving MIDI patterns from chords and rhythms. This app offers real-time control over note timing, gate, and swing, with a built-in FM synth for standalone use. It functions as an AUv3 MIDI plugin for hosts like AUM or as a standalone tool for sketching musical ideas.

**Highlights:** MIDI Arpeggiator (AUv3 plugin), Standalone app mode, Built-in FM synthesizer, Skippable steps & Euclidean rhythms, Chord Board for harmony generation, Real-time performance controls, Visual step grid feedback

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Soi free?

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

### Is MES Arpeggiator free?

MES Arpeggiator costs $14.99, with no in-app purchases.

### Which has better reviews, Soi or MES Arpeggiator?

MES Arpeggiator is rated higher. Soi averages 4.0 out of 5 from 2 ratings, while MES Arpeggiator averages 5.0 from 1 ratings.

### Do Soi or MES Arpeggiator have ads?

Neither Soi nor MES Arpeggiator shows ads.

### Which is updated more often, Soi or MES Arpeggiator?

Soi ships an update every 2 months, and MES Arpeggiator every 2 months. Most recently, Soi was updated on November 1, 2026 and MES Arpeggiator on October 28, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*