# Rainbow Piece vs Eat Chess

The clearest difference is in-app purchases: Rainbow Piece at none against Eat Chess's 4. Eat Chess's advantage is update cadence (every 5 days vs every 3 months) and iOS requirement (17.0 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. Eat Chess sells 4 one-off in-app purchases. Rainbow Piece asks for nothing beyond the download.

Rainbow Piece ships an update every 3 months, Eat Chess every 5 days. The most recent releases landed on October 15, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Rainbow Piece | Eat Chess |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/eat-chess-royal-merge/id6767652526/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 days** |
| Monetization | — | Free with in-app purchases |
| Size | 1 MB | 49 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | iPhone, Apple Watch | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Kiyoshi Izumi](https://appshunter.io/developer/1807085294) | [David Lew](https://appshunter.io/developer/1890623920) |

## What reviewers say

### Rainbow Piece

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

**Features:** Apple Watch app

**In-app purchases:** none


### Eat Chess

[App page](https://appshunter.io/ios/app/eat-chess-royal-merge/id6767652526)

This game combines chess mechanics with a merge puzzle on a compact 4x4 board. Strategically move pieces to merge them into higher-level ones, managing board space and building combos. It offers both solo challenges with various time controls and local multiplayer on a single device.

**Highlights:** Chess merge puzzle gameplay, Compact 4x4 board, Solo play with time controls, Local versus multiplayer, Castle Swap mechanic, Combo multipliers, Apple Watch support

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Chess Sets Pack | $1.99 | one-time |
| Themes Pack | $1.99 | one-time |
| Royal Bundle | $2.99 | one-time |
| Royal Patron | $9.99 | one-time |


## Frequently asked questions

### Is Rainbow Piece free?

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

### Is Eat Chess free?

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

### Do Rainbow Piece or Eat Chess have ads?

Neither Rainbow Piece nor Eat Chess shows ads.

### Which is updated more often, Rainbow Piece or Eat Chess?

Rainbow Piece ships an update every 3 months, and Eat Chess every 5 days. Most recently, Rainbow Piece was updated on October 15, 2026 and Eat Chess on October 8, 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.*