# SkyTower Challenge vs Alien Whack Attack

The clearest difference is update cadence: SkyTower Challenge at every 2 weeks against Alien Whack Attack's every 5 weeks. Alien Whack Attack's advantage is iOS requirement (12.0 vs 15.0). 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.

SkyTower Challenge ships an update every 2 weeks, Alien Whack Attack every 5 weeks. The most recent releases landed on October 3, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | SkyTower Challenge | Alien Whack Attack |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | **Every 2 weeks** | Every 5 weeks |
| Size | 171 MB | 105 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Takuma Takahashi](https://appshunter.io/developer/1704744113) | [Shinya Okubo](https://appshunter.io/developer/1831635146) |

## What reviewers say

### SkyTower Challenge

[App page](https://appshunter.io/ios/app/skytower-challenge/id6464111672)

**Features:** macOS Compatibility

**In-app purchases:** none


### Alien Whack Attack

[App page](https://appshunter.io/ios/app/alien-whack-attack/id6749657163)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SkyTower Challenge free?

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

### Is Alien Whack Attack free?

Alien Whack Attack is free to download, with no in-app purchases.

### Do SkyTower Challenge or Alien Whack Attack have ads?

Both SkyTower Challenge and Alien Whack Attack show ads.

### Which is updated more often, SkyTower Challenge or Alien Whack Attack?

SkyTower Challenge ships an update every 2 weeks, and Alien Whack Attack every 5 weeks. Most recently, SkyTower Challenge was updated on October 3, 2026 and Alien Whack Attack on October 2, 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.*