# KG Regenbogen vs iC4

The clearest difference is update cadence: iC4 at every 2 months against KG Regenbogen's every 4 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.

KG Regenbogen ships an update every 4 months, iC4 every 2 months. The most recent releases landed on October 20, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | KG Regenbogen | iC4 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Size | 12 MB | 50 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [online-Forum GmbH](https://appshunter.io/developer/1125974529) | [iChallenge UG haftungsbeschrankt](https://appshunter.io/developer/1579682503) |

## What reviewers say

### KG Regenbogen

[App page](https://appshunter.io/ios/app/kg-regenbogen/id1154838467)

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

**In-app purchases:** none


### iC4

[App page](https://appshunter.io/ios/app/ic4/id1505985073)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is KG Regenbogen free?

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

### Is iC4 free?

iC4 is free to download, with no in-app purchases.

### Do KG Regenbogen or iC4 have ads?

Neither KG Regenbogen nor iC4 shows ads.

### Which is updated more often, KG Regenbogen or iC4?

KG Regenbogen ships an update every 4 months, and iC4 every 2 months. Most recently, KG Regenbogen was updated on October 20, 2026 and iC4 on October 27, 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.*