# Sky Stack vs Stack Em

The clearest difference is iOS requirement: Sky Stack at 15.0 against Stack Em's 18.2. 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 | Sky Stack | Stack Em |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 3 days | — |
| Size | 104 MB | 44 MB |
| Requires iOS | **15.0** | 18.2 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Mehmet Resat Senel](https://appshunter.io/developer/1867533935) | [Chris Houston](https://appshunter.io/developer/1340538391) |

## What reviewers say

### Sky Stack

[App page](https://appshunter.io/ios/app/sky-stack-tower-builder/id6761363764)

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

**In-app purchases:** none


### Stack Em

[App page](https://appshunter.io/ios/app/stack-em-tower/id6761726968)

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

**In-app purchases:** none


## Frequently asked questions

### Is Sky Stack free?

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

### Is Stack Em free?

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

### Do Sky Stack or Stack Em have ads?

Both Sky Stack and Stack Em show 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.*