# D550 MIDI Controller vs Isomorphic Keyboard

The clearest difference is price: Isomorphic Keyboard at Free against D550 MIDI Controller's $9.99. Isomorphic Keyboard also leads on review sentiment (100% vs 80%). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Isomorphic Keyboard is free to download; D550 MIDI Controller costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | D550 MIDI Controller | Isomorphic Keyboard |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | — | **[4.5 (4 ratings)](https://appshunter.io/ios/app/isomorphic-keyboard/id6670605972/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | 80.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | — |
| Monetization | Paid | **Free** |
| Size | 67 MB | 23 MB |
| Requires iOS | 16.6 | **16.0** |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Michael Eskin](https://appshunter.io/developer/342739369) | [Nci Technology Inc.](https://appshunter.io/developer/868272704) |

## What reviewers say

### D550 MIDI Controller

[App page](https://appshunter.io/ios/app/d550-midi-controller/id1071138983)

This app simulates a hammered dulcimer as a MIDI controller for iPad. It allows users to play virtual instruments and hardware synthesizers without producing sound itself. Customize transpose, MIDI channels, velocity, and drag roll sensitivity for a unique musical experience.

**Highlights:** Hammered dulcimer simulation, MIDI control surface, Transpose up/down one octave, Adjustable drag roll sensitivity, Independent MIDI channel control, Velocity and volume adjustment, Virtual MIDI port support

**In-app purchases:** none


### Isomorphic Keyboard

[App page](https://appshunter.io/ios/app/isomorphic-keyboard/id6670605972)

Experience a unique hexagonal keyboard layout for music creation. This app recreates the playing experience of a Lumatone keyboard and supports custom soundfonts for diverse sonic possibilities.

**Highlights:** Hexagonal keyboard layout, Lumatone keyboard emulation, Custom soundfont support, Music synthesizer

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is D550 MIDI Controller free?

D550 MIDI Controller costs $9.99, with no in-app purchases.

### Is Isomorphic Keyboard free?

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

### Do D550 MIDI Controller or Isomorphic Keyboard have ads?

Neither D550 MIDI Controller nor Isomorphic Keyboard shows ads.

---

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