# Sudoku vs Rainbow Piece

The clearest difference is in-app purchases: Rainbow Piece at none against Sudoku's 2. Rainbow Piece also leads on ads (none vs shown). Sudoku's advantage is update cadence (every 3 weeks vs every 3 months) and iOS requirement (17.0 vs 26.0). On price and device support there is nothing between them.

Both are free to download. Sudoku sells 2 one-off in-app purchases. Rainbow Piece asks for nothing beyond the download.

Sudoku ships an update every 3 weeks, Rainbow Piece every 3 months. The most recent releases landed on September 26, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Sudoku | Rainbow Piece |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (15 ratings)](https://appshunter.io/ios/app/sudoku-color/id6744914148/reviews)** | — |
| Number of ratings | **15** | — |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | Ad-supported | — |
| Size | 7 MB | 1 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Nykylo Media LLC](https://appshunter.io/developer/1756660380) | [Kiyoshi Izumi](https://appshunter.io/developer/1807085294) |

## What reviewers say

### Sudoku

[App page](https://appshunter.io/ios/app/sudoku-color/id6744914148)

A vibrant twist on the classic logic game, this app uses colors instead of numbers to challenge your mind. Solve puzzles with intuitive design and adjustable difficulty levels. Enjoy endless, beautifully crafted boards offline.

**Highlights:** Color-based Sudoku puzzles, Adjustable difficulty levels, Hint system, Endless puzzles, Offline play support, Clean, user-friendly interface

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Nightmare Pack | $0.99 | one-time |
| Remove Ads | $1.99 | one-time |


### Rainbow Piece

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

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is Sudoku free?

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

### Is Rainbow Piece free?

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

### Do Sudoku or Rainbow Piece have ads?

Sudoku shows ads; Rainbow Piece does not.

### Which is updated more often, Sudoku or Rainbow Piece?

Sudoku ships an update every 3 weeks, and Rainbow Piece every 3 months. Most recently, Sudoku was updated on September 26, 2026 and Rainbow Piece on September 30, 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.*