# iO vs Booster Up!

The clearest difference is review sentiment: iO at 71% against Booster Up!'s 19%. iO also leads on ads (none vs shown). Booster Up!'s advantage is rating (4.6 vs 3.7) and update cadence (weekly vs every 6 weeks). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. iO sells 1 one-off in-app purchase and Booster Up! sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Booster Up! holds the better App Store score, 4.6 against 3.7. That said, the two scores are not equally well evidenced: Booster Up! has 17K ratings behind it against 19, so its average is the more settled of the two. Written reviews complicate that: 71% of iO's written reviews are positive against 19% of Booster Up!'s, so the app with the better star average is not the one people write more warmly about.

iO ships an update every 6 weeks, Booster Up! weekly. The most recent releases landed on November 1, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | iO | Booster Up! |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (19 ratings)](https://appshunter.io/ios/app/io-a-physics-platformer/id960831187/reviews) | **[4.6 (17K ratings)](https://appshunter.io/ios/app/booster-up/id1668176193/reviews)** |
| Number of ratings | 19 | **17K** |
| Positive reviews | **71.1% of reviews** | 19.2% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Weekly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 466 MB | 400 MB |
| Requires iOS | 11.0 | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Gamious B.V.](https://appshunter.io/developer/539181337) | [Rollic Games](https://appshunter.io/developer/1452111779) |

## What reviewers say

### iO

[App page](https://appshunter.io/ios/app/io-a-physics-platformer/id960831187)

A physics-based platformer where you manipulate size, speed, and momentum to solve over 225 challenging mazes. Features unique gameplay mechanics like portals and inverted gravity, with global leaderboards for competitive play.

**Highlights:** Size, weight, and mass manipulation, Over 225 challenging mazes, Portals and inverted gravity, Global leaderboards, Unlockable achievements, Intuitive touch controls

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove all advertisements | $0.99 | one-time |

**What reviewers like**

- 👍 Fun and addictive gameplay
- 💡 Challenging puzzles
- 🧠 Good for brain exercise
- ✨ Great design and idea
- 💯 Addictive and engaging

**What reviewers complain about**

- ❌ Unplayable due to ads
- 💸 Paid for ad-free, still shows ads
- 🐛 Game crashes frequently
- 🐞 Buttons cut off on mobile
- 🔇 No audio or sound effects

**Reported bugs**

- Ads not unlocking levels
- Paid ad-free, but ads persist
- Game crashes on startup or during gameplay
- Buttons cut off at screen edges
- Player phasing through walls

**Requested features**

- Fix ad-blocking payment issue
- Improve mobile formatting
- Add audio and sound effects
- Fix ad-related progression blockers
- Address crashing issues


### 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 (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Beginners Pack | $0.99 | one-time |
| Diamond - 3M | $1.99 | one-time |
| No ADS | $3.99 | one-time |
| Special Module Pack | $4.99 | 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 |
| 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


## Frequently asked questions

### Is iO free?

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

### Is Booster Up! free?

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

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

Booster Up! is rated higher. iO averages 3.7 out of 5 from 19 ratings, while Booster Up! averages 4.6 from 17K ratings.

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

Booster Up! shows ads; iO does not.

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

iO ships an update every 6 weeks, and Booster Up! weekly. Most recently, iO was updated on November 1, 2026 and Booster Up! on November 9, 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.*