# Stack 101 Tower vs Perimeter Zero

The clearest difference is in-app purchases: Stack 101 Tower at none against Perimeter Zero's 1. Stack 101 Tower also leads on iOS requirement (12.0 vs 16.0). Perimeter Zero's advantage is update cadence (every 2 days vs every 5 days). On price, ads and device support there is nothing between them.

Both are free to download. Perimeter Zero sells 1 one-off in-app purchase. Stack 101 Tower asks for nothing beyond the download.

Stack 101 Tower ships an update every 5 days, Perimeter Zero every 2 days. The most recent releases landed on October 2, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Stack 101 Tower | Perimeter Zero |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 5 days | **Every 2 days** |
| Size | 54 MB | 11 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [ZHENG YU-XIANG](https://appshunter.io/developer/1863257025) | [Hyacinthe Loua](https://appshunter.io/developer/6777148473) |

## What reviewers say

### Stack 101 Tower

[App page](https://appshunter.io/ios/app/stack-101-tower/id6759484448)

**Features:** macOS Compatibility

**In-app purchases:** none


### Perimeter Zero

[App page](https://appshunter.io/ios/app/perimeter-zero/id6786819667)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PerimeterZero Premium | $2.99 | one-time |


## Frequently asked questions

### Is Stack 101 Tower free?

Stack 101 Tower is free to download, with no in-app purchases.

### Is Perimeter Zero free?

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

### Do Stack 101 Tower or Perimeter Zero have ads?

Both Stack 101 Tower and Perimeter Zero show ads.

### Which is updated more often, Stack 101 Tower or Perimeter Zero?

Stack 101 Tower ships an update every 5 days, and Perimeter Zero every 2 days. Most recently, Stack 101 Tower was updated on October 2, 2026 and Perimeter Zero on September 29, 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.*