# KeyMorph vs ostinata

The clearest difference is update cadence: ostinata at every 9 days against KeyMorph's every 3 weeks. KeyMorph's advantage is iOS requirement (15.1 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

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

KeyMorph ships an update every 3 weeks, ostinata every 9 days. The most recent releases landed on October 8, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | KeyMorph | ostinata |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ostinata/id6762445694/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 9 days** |
| Size | 31 MB | 2 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Omni Devs](https://appshunter.io/developer/1830893808) | [Joachim Groeger](https://appshunter.io/developer/1887008617) |

## 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


### ostinata

[App page](https://appshunter.io/ios/app/ostinata/id6762445694)

**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 ostinata free?

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

### Do KeyMorph or ostinata have ads?

Neither KeyMorph nor ostinata shows ads.

### Which is updated more often, KeyMorph or ostinata?

KeyMorph ships an update every 3 weeks, and ostinata every 9 days. Most recently, KeyMorph was updated on October 8, 2026 and ostinata 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.*