# Fit the Donut vs Rainbow Piece

The clearest difference is update cadence: Fit the Donut at every 2 days against Rainbow Piece's every 3 months. Fit the Donut also leads on iOS requirement (9.0 vs 26.0). 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.

Fit the Donut ships an update every 2 days, Rainbow Piece every 3 months. The most recent releases landed on September 30, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Fit the Donut | Rainbow Piece |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 3 months |
| Size | 113 MB | 1 MB |
| Requires iOS | **9.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Nguyen Thanh](https://appshunter.io/developer/1533013045) | [Kiyoshi Izumi](https://appshunter.io/developer/1807085294) |

## What reviewers say

### Fit the Donut

[App page](https://appshunter.io/ios/app/fit-the-donut/id1550482815)

**Features:** macOS Compatibility

**In-app purchases:** none


### Rainbow Piece

[App page](https://appshunter.io/ios/app/rainbow-piece/id6745691663)

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is Fit the Donut free?

Fit the Donut is free to download, with no in-app purchases.

### Is Rainbow Piece free?

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

### Do Fit the Donut or Rainbow Piece have ads?

Neither Fit the Donut nor Rainbow Piece shows ads.

### Which is updated more often, Fit the Donut or Rainbow Piece?

Fit the Donut ships an update every 2 days, and Rainbow Piece every 3 months. Most recently, Fit the Donut was updated on September 30, 2026 and Rainbow Piece 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.*