# KeyMorph vs ToneGen PlusMinus

The clearest difference is update cadence: KeyMorph at every 3 weeks against ToneGen PlusMinus's every 3 months. 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, ToneGen PlusMinus every 3 months. The most recent releases landed on October 28, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | KeyMorph | ToneGen PlusMinus |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Size | 31 MB | 39 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Omni Devs](https://appshunter.io/developer/1830893808) | [Dan Richardson](https://appshunter.io/developer/1723614187) |

## 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


### ToneGen PlusMinus

[App page](https://appshunter.io/ios/app/tonegen-plusminus/id6758056304)

**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 ToneGen PlusMinus free?

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

### Do KeyMorph or ToneGen PlusMinus have ads?

Neither KeyMorph nor ToneGen PlusMinus shows ads.

### Which is updated more often, KeyMorph or ToneGen PlusMinus?

KeyMorph ships an update every 3 weeks, and ToneGen PlusMinus every 3 months. Most recently, KeyMorph was updated on October 28, 2026 and ToneGen PlusMinus on November 9, 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.*