# Sky Stack vs Stack Tower Up

The clearest difference is in-app purchases: Sky Stack at none against Stack Tower Up's 1. Sky Stack also leads on update cadence (every 3 days vs monthly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Stack Tower Up sells 1 one-off in-app purchase. Sky Stack asks for nothing beyond the download.

Sky Stack ships an update every 3 days, Stack Tower Up monthly. The most recent releases landed on October 3, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Sky Stack | Stack Tower Up |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 3 days** | Monthly |
| Size | 104 MB | 6 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Mehmet Resat Senel](https://appshunter.io/developer/1867533935) | [丽佳 施](https://appshunter.io/developer/1894580777) |

## 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 Tower Up

[App page](https://appshunter.io/ios/app/stack-tower-up/id6769321760)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |


## Frequently asked questions

### Is Sky Stack free?

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

### Is Stack Tower Up free?

Stack Tower Up is free to download, with in-app purchases available.

### Do Sky Stack or Stack Tower Up have ads?

Both Sky Stack and Stack Tower Up show ads.

### Which is updated more often, Sky Stack or Stack Tower Up?

Sky Stack ships an update every 3 days, and Stack Tower Up monthly. Most recently, Sky Stack was updated on October 3, 2026 and Stack Tower Up on September 20, 2026.

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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.*