# Koos vs Rainbow AI

Koos and Rainbow AI are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Koos ships an update every 4 weeks, Rainbow AI every 2 months. The most recent releases landed on October 7, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Koos | Rainbow AI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Every 2 months |
| Size | 34 MB | 73 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Provaleo SAS](https://appshunter.io/developer/1849118726) | [Mano Labelle](https://appshunter.io/developer/1871881795) |

## What reviewers say

### Koos

[App page](https://appshunter.io/ios/app/koos/id6754595283)

**Features:** macOS Compatibility

**In-app purchases:** none


### Rainbow AI

[App page](https://appshunter.io/ios/app/rainbow-ai/id6758268983)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Koos free?

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

### Is Rainbow AI free?

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

### Do Koos or Rainbow AI have ads?

Neither Koos nor Rainbow AI shows ads.

### Which is updated more often, Koos or Rainbow AI?

Koos ships an update every 4 weeks, and Rainbow AI every 2 months. Most recently, Koos was updated on October 7, 2026 and Rainbow AI on October 15, 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.*