# UnDo vs Kotonemu

The clearest difference is in-app purchases: UnDo at none against Kotonemu's 2. UnDo also leads on update cadence (weekly vs every 5 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Kotonemu sells 2 one-off in-app purchases. UnDo asks for nothing beyond the download.

UnDo ships an update weekly, Kotonemu every 5 weeks. Both last shipped on October 31, 2026.

## The numbers

| Metric | UnDo | Kotonemu |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 5 weeks |
| Size | 2 MB | 38 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [朝峰 陈](https://appshunter.io/developer/1868597907) | [GYOU GI](https://appshunter.io/developer/6776104453) |

## What reviewers say

### UnDo

[App page](https://appshunter.io/ios/app/undo/id6761196951)

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

**In-app purchases:** none


### Kotonemu

[App page](https://appshunter.io/ios/app/kotonemu/id6800693416)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| At Your Ear | $12.99 | one-time |
| All Night | $12.99 | one-time |


## Frequently asked questions

### Is UnDo free?

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

### Is Kotonemu free?

Kotonemu is free to download, with in-app purchases available.

### Do UnDo or Kotonemu have ads?

Neither UnDo nor Kotonemu shows ads.

### Which is updated more often, UnDo or Kotonemu?

UnDo ships an update weekly, and Kotonemu every 5 weeks. Most recently, UnDo was updated on October 31, 2026 and Kotonemu on October 31, 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.*