# Challenge Puzzle Square vs Ultimate Sudoku Pro

The clearest difference is iOS requirement: Ultimate Sudoku Pro at 9.0 against Challenge Puzzle Square's 18.5. 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.

## The numbers

| Metric | Challenge Puzzle Square | Ultimate Sudoku Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Every 4 days |
| Size | 0 MB | 61 MB |
| Requires iOS | 18.5 | **9.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [PETER JAMES SIDES](https://appshunter.io/developer/1619752154) | [Laurent Scotto](https://appshunter.io/developer/1885359935) |

## What reviewers say

### Challenge Puzzle Square

[App page](https://appshunter.io/ios/app/challenge-puzzle-square/id6753913745)

**Features:** macOS Compatibility

**In-app purchases:** none


### Ultimate Sudoku Pro

[App page](https://appshunter.io/ios/app/ultimate-sudoku-pro/id6760619348)

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

**In-app purchases:** none


## Frequently asked questions

### Is Challenge Puzzle Square free?

Challenge Puzzle Square is free to download, with no in-app purchases.

### Is Ultimate Sudoku Pro free?

Ultimate Sudoku Pro is free to download, with no in-app purchases.

### Do Challenge Puzzle Square or Ultimate Sudoku Pro have ads?

Neither Challenge Puzzle Square nor Ultimate Sudoku Pro shows ads.

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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.*