# Rainbow Piece vs Viper maze

The clearest difference is price: Rainbow Piece at Free against Viper maze's $1.99. Rainbow Piece also leads on in-app purchases (none vs 1). Viper maze's advantage is iOS requirement (13.0 vs 26.0). On update cadence, ads and device support there is nothing between them.

Rainbow Piece is free to download; Viper maze costs $1.99 up front. Viper maze sells 1 one-off in-app purchase. Rainbow Piece asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 3 months. Both last shipped on October 15, 2026.

## The numbers

| Metric | Rainbow Piece | Viper maze |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Size | 1 MB | 6 MB |
| Requires iOS | 26.0 | **13.0** |
| Devices | iPhone, Apple Watch | **iPhone, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Kiyoshi Izumi](https://appshunter.io/developer/1807085294) | [Martin Gruner](https://appshunter.io/developer/1824447154) |

## What reviewers say

### Rainbow Piece

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

**Features:** Apple Watch app

**In-app purchases:** none


### Viper maze

[App page](https://appshunter.io/ios/app/viper-maze/id6748138935)

**Features:** Apple Watch app

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Full game | $3.99 | one-time |


## Frequently asked questions

### Is Rainbow Piece free?

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

### Is Viper maze free?

Viper maze costs $1.99, and also offers in-app purchases.

### Do Rainbow Piece or Viper maze have ads?

Neither Rainbow Piece nor Viper maze shows ads.

### Which is updated more often, Rainbow Piece or Viper maze?

Rainbow Piece ships an update every 3 months, and Viper maze every 3 months. Most recently, Rainbow Piece was updated on October 15, 2026 and Viper maze 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.*