# Booster Up! vs ZapStack

The clearest difference is review sentiment: ZapStack at 100% against Booster Up!'s 19%. ZapStack also leads on in-app purchases (none vs 14) and ads (none vs shown). Booster Up!'s advantage is ratings volume (17K vs 1) and iOS requirement (11.0 vs 15.6). On price, update cadence and device support there is nothing between them.

Both are free to download. Booster Up! sells 14 one-off in-app purchases. ZapStack asks for nothing beyond the download.

ZapStack holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Booster Up! has 17K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 19% of Booster Up!'s written reviews are positive against 100% of ZapStack's.

Booster Up! ships an update weekly, ZapStack every 4 days. The most recent releases landed on October 20, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Booster Up! | ZapStack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (17K ratings)](https://appshunter.io/ios/app/booster-up/id1668176193/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/zapstack/id6759278053/reviews)** |
| Number of ratings | **17K** | 1 |
| Positive reviews | 19.2% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Weekly | **Every 4 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 400 MB | 5 MB |
| Requires iOS | **11.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Rollic Games](https://appshunter.io/developer/1452111779) | [Indus Siam LLC](https://appshunter.io/developer/1875605848) |

## What reviewers say

### Booster Up!

[App page](https://appshunter.io/ios/app/booster-up/id1668176193)

Embark on an intergalactic adventure by merging rocket modules to create powerful spacecraft. Launch your rocket, explore planets, collect rewards, and upgrade components to fly farther and overcome challenges.

**Highlights:** Merge rocket modules, Launch and explore planets, Collect rewards and stars, Upgrade rocket components, Unlock new rockets, Overcome space challenges

**Features:** macOS Compatibility

**In-app purchases (14)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Beginners Pack | $0.99 | one-time |
| Money - 50M | $1.99 | one-time |
| Diamond - 3M | $1.99 | one-time |
| No ADS | $3.99 | one-time |
| Special Module Pack | $4.99 | one-time |
| Skip It - 60x | $5.99 | one-time |
| Diamond - 25M | $5.99 | one-time |
| Adventurer’s Pack | $6.99 | one-time |
| Adventurer's Pack with No-Ads | $9.99 | one-time |
| Astronaut’s Pack | $12.99 | one-time |
| Astronaut’s Pack with No Ads | $14.99 | one-time |
| Explorer’s Pack | $19.99 | one-time |
| Diamond - 150M | $19.99 | one-time |
| Explorer’s Pack with No Ads | $24.99 | one-time |

**What reviewers like**

- 🚀 Fun and challenging gameplay
- 🚀 Simple and intuitive controls
- 👍 Visually appealing graphics

**What reviewers complain about**

- 🐛 Frequent bugs and glitches
- 💸 Excessive in-app advertisements
- 🔒 Requires internet connection to play
- 🔋 High battery consumption

**Reported bugs**

- Rocket parts disappearing after upgrades
- Inability to reach or progress past certain planets
- Inconsistent reward payouts
- Game freezing or crashing
- Saved progress not loading correctly

**Requested features**

- Offline play mode
- More diverse rocket and module options
- Improved progression system
- Better reward balancing


### ZapStack

[App page](https://appshunter.io/ios/app/zapstack/id6759278053)

A one-tap precision platformer where timing is crucial to build the tallest tower. Land perfectly to keep platforms open, or drift and face shrinking gaps. Compete with friends and unlock new themes.

**Highlights:** One-tap precision jumping, Swinging platform mechanics, Perfect landing bonuses, Unlockable themes, Game Center leaderboards, Share high scores

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

**In-app purchases:** none


## Frequently asked questions

### Is Booster Up! free?

Booster Up! is free to download, with in-app purchases available.

### Is ZapStack free?

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

### Which has better reviews, Booster Up! or ZapStack?

ZapStack is rated higher. Booster Up! averages 4.6 out of 5 from 17K ratings, while ZapStack averages 5.0 from 1 ratings.

### Do Booster Up! or ZapStack have ads?

Booster Up! shows ads; ZapStack does not.

### Which is updated more often, Booster Up! or ZapStack?

Booster Up! ships an update weekly, and ZapStack every 4 days. Most recently, Booster Up! was updated on October 20, 2026 and ZapStack on October 10, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*