# Sudoku51 vs Astro Drift Space

The clearest difference is in-app purchases: Sudoku51 at none against Astro Drift Space's 3. Sudoku51 also leads on ads (none vs shown). Astro Drift Space's advantage is iOS requirement (11.0 vs 17.6). On price and device support there is nothing between them.

Both are free to download. Astro Drift Space sells 3 one-off in-app purchases. Sudoku51 asks for nothing beyond the download.

## The numbers

| Metric | Sudoku51 | Astro Drift Space |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 14 months | — |
| Size | 9 MB | 389 MB |
| Requires iOS | 17.6 | **11.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Herbert Caller](https://appshunter.io/developer/1352839830) | [Milan Janssen](https://appshunter.io/developer/1609864174) |

## What reviewers say

### Sudoku51

[App page](https://appshunter.io/ios/app/sudoku51/id1450760182)

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

**In-app purchases:** none


### Astro Drift Space

[App page](https://appshunter.io/ios/app/astro-drift-space/id1671012322)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove ADS | $0.99 | one-time |
| Moon bundle | $2.99 | one-time |
| Shuttle Booster bundle | $4.99 | one-time |


## Frequently asked questions

### Is Sudoku51 free?

Sudoku51 is free to download, with no in-app purchases.

### Is Astro Drift Space free?

Astro Drift Space is free to download, with in-app purchases available.

### Do Sudoku51 or Astro Drift Space have ads?

Astro Drift Space shows ads; Sudoku51 does not.

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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.*