# KeyMorph vs Gradation Piano

The clearest difference is device support: KeyMorph at 3 against Gradation Piano's 1. KeyMorph also leads on iOS requirement (15.1 vs 18.6). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | KeyMorph | Gradation Piano |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | — |
| Size | 31 MB | 6 MB |
| Requires iOS | **15.1** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Omni Devs](https://appshunter.io/developer/1830893808) | [MASATO MISAWA](https://appshunter.io/developer/1609449895) |

## What reviewers say

### KeyMorph

[App page](https://appshunter.io/ios/app/keymorph-music-transposition/id6749544555)

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

**In-app purchases:** none


### Gradation Piano

[App page](https://appshunter.io/ios/app/gradation-piano/id6778021165)

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

**In-app purchases:** none


## Frequently asked questions

### Is KeyMorph free?

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

### Is Gradation Piano free?

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

### Do KeyMorph or Gradation Piano have ads?

Neither KeyMorph nor Gradation Piano shows ads.

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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.*