# Stack Attack!! vs Slapping Penguin

The clearest difference is in-app purchases: Slapping Penguin at none against Stack Attack!!'s 19. Slapping Penguin also leads on update cadence (every 2 days vs every 2 weeks) and iOS requirement (12.0 vs 14.0). On price, ads and device support there is nothing between them.

Both are free to download. Stack Attack!! sells 19 one-off in-app purchases. Slapping Penguin asks for nothing beyond the download.

Stack Attack!! ships an update every 2 weeks, Slapping Penguin every 2 days. The most recent releases landed on August 19, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Stack Attack!! | Slapping Penguin |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (403 ratings)](https://appshunter.io/ios/app/stack-attack/id6566190313/reviews)** | — |
| Number of ratings | **403** | — |
| Positive reviews | 23.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 2 weeks | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Size | 247 MB | 53 MB |
| Requires iOS | 14.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Voodoo](https://appshunter.io/developer/714804730) | [Aurelien YOL](https://appshunter.io/developer/6783976948) |

## What reviewers say

### Stack Attack!!

[App page](https://appshunter.io/ios/app/stack-attack/id6566190313)

Engage in intense battles against waves of enemies, strategically demolishing their formations with powerful weapons. Upgrade your capabilities by selecting the best skills to protect the cube world from a malevolent hex invasion.

**Highlights:** Defeat enemy waves, Demolish enemy stacks, Upgrade skills, Save the cube world, Space invader gameplay

**Features:** macOS Compatibility

**In-app purchases (19)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gem Pack Small | $0.99 | one-time |
| Gold Pack Small | $0.99 | one-time |
| Starter Pack | $2.99 | one-time |
| No Ads | $2.99 | one-time |
| Gem Pack Medium | $4.99 | one-time |
| 2X Speed! | $4.99 | one-time |
| Gold Pack Medium | $4.99 | one-time |
| Skip'its Medium Pack | $5.99 | one-time |
| Gem Pack Large | $9.99 | one-time |
| Gold Pack Large | $9.99 | one-time |
| Premium Pass | $14.99 | one-time |
| Gem Pack XL | $19.99 | one-time |
| Skip'its Large Pack | $19.99 | one-time |
| Gold Pack XL | $19.99 | one-time |
| Diamond Hero | $29.99 | one-time |
| Gem Pack XXL | $49.99 | one-time |
| Gold Pack XXL | $49.99 | one-time |
| Gem Pack XXXL | $99.99 | one-time |
| Gold Pack XXXL | $99.99 | one-time |

**What reviewers like**

- 👍 Simple and fun gameplay
- 🚀 No ads or microtransactions
- 💡 Nice armor upgrade system

**What reviewers complain about**

- 🐛 Glitches and bugs, especially after updates
- 🐛 Progress and upgrades getting reset or lost
- 🐛 Levels becoming unplayable after a certain point

**Reported bugs**

- Enemies' health scaling with player's attack power
- Levels freezing or getting stuck at checkpoints
- Weapon and upgrade levels getting downgraded randomly

**Requested features**

- Mute sound effects option
- Better communication from developers about updates
- More content and stages to progress through


### Slapping Penguin

[App page](https://appshunter.io/ios/app/slapping-penguin/id6783976946)

**In-app purchases:** none


## Frequently asked questions

### Is Stack Attack!! free?

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

### Is Slapping Penguin free?

Slapping Penguin is free to download, with no in-app purchases.

### Do Stack Attack!! or Slapping Penguin have ads?

Both Stack Attack!! and Slapping Penguin show ads.

### Which is updated more often, Stack Attack!! or Slapping Penguin?

Stack Attack!! ships an update every 2 weeks, and Slapping Penguin every 2 days. Most recently, Stack Attack!! was updated on August 19, 2026 and Slapping Penguin on September 19, 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.*