# Isotope MIDI Keyboard vs polymachine

The clearest difference is price: polymachine at Free against Isotope MIDI Keyboard's $6.99. polymachine also leads on review sentiment (100% vs 80%). Isotope MIDI Keyboard's advantage is rating (4.9 vs 2.5) and update cadence (every 2 days vs weekly). On ads, in-app purchases, monetization model and device support there is nothing between them.

polymachine is free to download; Isotope MIDI Keyboard costs $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Isotope MIDI Keyboard holds the better App Store score, 4.9 against 2.5. That said, the two scores are not equally well evidenced: Isotope MIDI Keyboard has 10 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 80% of Isotope MIDI Keyboard's written reviews are positive against 100% of polymachine's, so the app with the better star average is not the one people write more warmly about.

Isotope MIDI Keyboard ships an update every 2 days, polymachine weekly. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Isotope MIDI Keyboard | polymachine |
| --- | --- | --- |
| Price | $6.99 | **Free** |
| Rating | **[4.9 (10 ratings)](https://appshunter.io/ios/app/isotope-midi-keyboard/id1667140170/reviews)** | [2.5 (2 ratings)](https://appshunter.io/ios/app/polymachine/id6761276852/reviews) |
| Number of ratings | **10** | 2 |
| Positive reviews | 80.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 days** | Weekly |
| Monetization | Paid | Paid |
| Size | 3 MB | 93 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Jaewon Choi](https://appshunter.io/developer/1324431041) | [Mike Gao](https://appshunter.io/developer/384844113) |

## What reviewers say

### Isotope MIDI Keyboard

[App page](https://appshunter.io/ios/app/isotope-midi-keyboard/id1667140170)

This app offers an intuitive and accessible way to play music and learn music theory. Its unique isomorphic grid layout simplifies chord playing and understanding note relationships, making it ideal for both beginners and experienced musicians.

**Highlights:** Isomorphic grid layout for intuitive playing, Built-in Element sound engine, Audio Unit v3 plugin support, MIDI and MIDI over Bluetooth connectivity, Velocity-based touch and accelerometer input, Customizable themes and layouts

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### polymachine

[App page](https://appshunter.io/ios/app/polymachine/id6761276852)

This app offers a unique approach to music creation by combining geometric principles with modular synthesis. Explore generative algorithmic drums, oscillators, and harmonies, with specialized tools for 808s and kick drum integration.

**Highlights:** Geometric music theory integration, Modular synthesis engine, Generative algorithmic drums, Oscillators and harmonies, 808 and kick drum linking, Log drum pattern generator

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Isotope MIDI Keyboard free?

Isotope MIDI Keyboard costs $6.99, with no in-app purchases.

### Is polymachine free?

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

### Which has better reviews, Isotope MIDI Keyboard or polymachine?

Isotope MIDI Keyboard is rated higher. Isotope MIDI Keyboard averages 4.9 out of 5 from 10 ratings, while polymachine averages 2.5 from 2 ratings.

### Do Isotope MIDI Keyboard or polymachine have ads?

Neither Isotope MIDI Keyboard nor polymachine shows ads.

### Which is updated more often, Isotope MIDI Keyboard or polymachine?

Isotope MIDI Keyboard ships an update every 2 days, and polymachine weekly. Most recently, Isotope MIDI Keyboard was updated on October 24, 2026 and polymachine on October 25, 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.*