# ChessUnlock vs Sphinx

The clearest difference is in-app purchases: ChessUnlock at none against Sphinx's 2. ChessUnlock also leads on device support (3 vs 1) and iOS requirement (15.6 vs 17.0). On price and ads there is nothing between them.

Both are free to download. Sphinx sells 2 in-app purchases, starting at $4.99 per month. ChessUnlock asks for nothing beyond the download.

## The numbers

| Metric | ChessUnlock | Sphinx |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Weekly |
| Size | 30 MB | 10 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Sawan Ishpujani](https://appshunter.io/developer/6778961385) | [Kevin Nguyen](https://appshunter.io/developer/1896702809) |

## What reviewers say

### ChessUnlock

[App page](https://appshunter.io/ios/app/chessunlock/id6778961383)

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

**In-app purchases:** none


### Sphinx

[App page](https://appshunter.io/ios/app/sphinx-screen-time-puzzles/id6808034180)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sphinx Pro | $4.99 | per month |
| Sphinx Pro | $29.99 | per year |


## Frequently asked questions

### Is ChessUnlock free?

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

### Is Sphinx free?

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

### Do ChessUnlock or Sphinx have ads?

Neither ChessUnlock nor Sphinx 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.*