# Duo Blocks vs Marble Flow 3D

The clearest difference is ads: Duo Blocks at none against Marble Flow 3D's shown. Marble Flow 3D's advantage is iOS requirement (12.0 vs 15.0). On price, 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 | Duo Blocks | Marble Flow 3D |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Daily | — |
| Size | 25 MB | 183 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Yuki Inaba](https://appshunter.io/developer/1896551072) | [ferran ases](https://appshunter.io/developer/1522208276) |

## What reviewers say

### Duo Blocks

[App page](https://appshunter.io/ios/app/duo-blocks/id6768885620)

**Features:** macOS Compatibility

**In-app purchases:** none


### Marble Flow 3D

[App page](https://appshunter.io/ios/app/marble-flow-3d/id6790187217)

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

**In-app purchases:** none


## Frequently asked questions

### Is Duo Blocks free?

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

### Is Marble Flow 3D free?

Marble Flow 3D is free to download, with no in-app purchases.

### Do Duo Blocks or Marble Flow 3D have ads?

Marble Flow 3D shows ads; Duo Blocks 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.*