# Power Tower vs Stack Knife

The clearest difference is ads: Stack Knife at none against Power Tower's shown. Stack Knife also leads on update cadence (every 3 weeks vs every 4 months) and iOS requirement (11.0 vs 15.2). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Power Tower sells 10 one-off in-app purchases and Stack Knife sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Power Tower ships an update every 4 months, Stack Knife every 3 weeks. The most recent releases landed on October 10, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Power Tower | Stack Knife |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (10 ratings)](https://appshunter.io/ios/app/power-tower/id1214988099/reviews)** | — |
| Number of ratings | **10** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 124 MB | 303 MB |
| Requires iOS | 15.2 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Motionlab](https://appshunter.io/developer/661748917) | [Wavelet Lab Inc.](https://appshunter.io/developer/1072996241) |

## What reviewers say

### Power Tower

[App page](https://appshunter.io/ios/app/power-tower/id1214988099)

Engage in rapid bouncing gameplay to reach new heights. Collect a variety of unique balls and unlock new visual and auditory elements. Compete with friends and global players by comparing your top scores.

**Highlights:** Fast-paced bouncing action, Collect 48 wacky balls, Unlock new styles and sounds, Compare high scores globally, Test your reactions

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Crazy Ball #2 | $0.99 | one-time |
| Crazy Ball #4 | $0.99 | one-time |
| Crazy Ball #3 | $0.99 | one-time |
| Velcro Ball | $0.99 | one-time |
| Balance Ball | $0.99 | one-time |
| Web Ball | $0.99 | one-time |
| Honey Ball | $0.99 | one-time |
| + 2K Gems | $2.99 | one-time |
| + 5k Gems | $3.99 | one-time |
| + 10k Gems | $4.99 | one-time |


### Stack Knife

[App page](https://appshunter.io/ios/app/stack-knife/id1453240354)

**Features:** macOS Compatibility

**In-app purchases (1)**

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


## Frequently asked questions

### Is Power Tower free?

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

### Is Stack Knife free?

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

### Do Power Tower or Stack Knife have ads?

Power Tower shows ads; Stack Knife does not.

### Which is updated more often, Power Tower or Stack Knife?

Power Tower ships an update every 4 months, and Stack Knife every 3 weeks. Most recently, Power Tower was updated on October 10, 2026 and Stack Knife on October 5, 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.*