# Keys vs MES Arpeggiator

The clearest difference is price: Keys at $5.99 against MES Arpeggiator's $14.99. MES Arpeggiator's advantage is update cadence (every 2 months vs every 10 months) and iOS requirement (12.0 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

Keys costs $5.99 and MES Arpeggiator $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Keys ships an update every 10 months, MES Arpeggiator every 2 months. The most recent releases landed on October 6, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Keys | MES Arpeggiator |
| --- | --- | --- |
| Price | **$5.99** | $14.99 |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/keys-midi-controller/id1668785508/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 2 months** |
| Monetization | Paid | — |
| Size | 17 MB | 32 MB |
| Requires iOS | 17.0 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [LittleCodeShop.com](https://appshunter.io/developer/288684013) | [Make Electronic Sound OU](https://appshunter.io/developer/1874343004) |

## What reviewers say

### Keys

[App page](https://appshunter.io/ios/app/keys-midi-controller/id1668785508)

Turn your mobile device into a versatile MIDI master keyboard. Connect wirelessly to musical instruments and DAWs to control virtual instruments and enhance your music production and live performances.

**Highlights:** Transform device into MIDI master keyboard, Connect to musical devices, Send MIDI notes and CC, Control virtual instruments, MIDI over Bluetooth, Customizable MIDI mapping

**Features:** Vision Pro support

**In-app purchases:** none


### MES Arpeggiator

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Keys free?

Keys costs $5.99, with no in-app purchases.

### Is MES Arpeggiator free?

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

### Do Keys or MES Arpeggiator have ads?

Neither Keys nor MES Arpeggiator shows ads.

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

Keys ships an update every 10 months, and MES Arpeggiator every 2 months. Most recently, Keys was updated on October 6, 2026 and MES Arpeggiator on October 14, 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.*