# Crystal Scorpion Solitaire vs Doku!

The clearest difference is in-app purchases: Doku! at none against Crystal Scorpion Solitaire's 1. Doku! also leads on update cadence (daily vs every 8 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Crystal Scorpion Solitaire sells 1 one-off in-app purchase. Doku! asks for nothing beyond the download.

Crystal Scorpion Solitaire ships an update every 8 months, Doku! daily. The most recent releases landed on October 12, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Crystal Scorpion Solitaire | Doku! |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/doku/id6798410076/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 8 months | **Daily** |
| Monetization | — | Ad-supported |
| Size | 17 MB | 79 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Crystal Squid](https://appshunter.io/developer/1004521401) | [Poliglot](https://appshunter.io/developer/6798410078) |

## What reviewers say

### Crystal Scorpion Solitaire

[App page](https://appshunter.io/ios/app/crystal-scorpion-solitaire/id6743439504)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


### Doku!

[App page](https://appshunter.io/ios/app/doku/id6798410076)

This logic puzzle game challenges you to place dots on a board based on color regions and symbol clues. It offers a daily puzzle to maintain a streak and a journey mode with 150 levels across 11 chapters. Accessibility features and leaderboards are included.

**Highlights:** Daily logic puzzles, 150 levels across 11 chapters, Color vision palettes, Lettered regions for colorblindness, Daily and journey leaderboards, Offline puzzle solving

**In-app purchases:** none


## Frequently asked questions

### Is Crystal Scorpion Solitaire free?

Crystal Scorpion Solitaire is free to download, with in-app purchases available.

### Is Doku! free?

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

### Do Crystal Scorpion Solitaire or Doku! have ads?

Both Crystal Scorpion Solitaire and Doku! show ads.

### Which is updated more often, Crystal Scorpion Solitaire or Doku!?

Crystal Scorpion Solitaire ships an update every 8 months, and Doku! daily. Most recently, Crystal Scorpion Solitaire was updated on October 12, 2026 and Doku! on October 4, 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.*