# Planet simulation vs Atom Fusion

The clearest difference is in-app purchases: Planet simulation at none against Atom Fusion's 1. Planet simulation also leads on ratings volume (164 vs 6). Atom Fusion's advantage is ads (none vs shown) and update cadence (every 5 days vs every 7 months). On price and device support there is nothing between them.

Both are free to download. Atom Fusion sells 1 one-off in-app purchase. Planet simulation asks for nothing beyond the download.

Atom Fusion holds the better App Store score, 4.3 against 3.9. That said, the two scores are not equally well evidenced: Planet simulation has 164 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 74% of Planet simulation's written reviews are positive against 100% of Atom Fusion's.

Planet simulation ships an update every 7 months, Atom Fusion every 5 days. The most recent releases landed on September 28, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Planet simulation | Atom Fusion |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.9 (164 ratings)](https://appshunter.io/ios/app/planet-simulation/id356146219/reviews) | **[4.3 (6 ratings)](https://appshunter.io/ios/app/atom-fusion/id1373864217/reviews)** |
| Number of ratings | **164** | 6 |
| Positive reviews | 74.3% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 7 months | **Every 5 days** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 15 MB | 12 MB |
| Requires iOS | 13.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [DAN-BALL](https://appshunter.io/developer/348592290) | [Dennis van Oosten](https://appshunter.io/developer/1373864216) |

## What reviewers say

### Planet simulation

[App page](https://appshunter.io/ios/app/planet-simulation/id356146219)

Design and build your own solar system with various stars. Explore the fascinating world of gravity and recreate celestial bodies. A relaxing game for your spare time.

**Highlights:** Create your own solar system, Simulate gravity, Design with various stars, Reproduce celestial bodies, Relaxing gameplay

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

**In-app purchases:** none

**What reviewers like**

- 🚀 Realistic gravity simulation
- 👍 Fun to mess around with
- 🎨 Visually appealing
- 🤖 Good for learning about planetary motion

**What reviewers complain about**

- 🐛 Planets often crash into the sun
- 🔍 Limited features and customization options
- 📢 Distracting ads
- 🤯 Confusing controls and UI

**Reported bugs**

- Planets sometimes disappear or behave erratically
- App crashes or freezes occasionally
- Scaling and scrolling issues

**Requested features**

- Add more celestial objects (black holes, supernovas, etc.)
- Allow for more complex orbits and binary systems
- Implement a save/load feature for solar systems
- Add a tutorial or help section
- Integrate with educational resources on astronomy


### Atom Fusion

[App page](https://appshunter.io/ios/app/atom-fusion/id1373864217)

A casual tapping game where atoms fuse to create new elements. Research new atoms with a particle accelerator to discover all 118 elements of the periodic table.

**Highlights:** Atom fusion gameplay, Discover all 118 elements, Particle accelerator research, Casual tapping mechanics, Progressive discovery

**Features:** macOS Compatibility

**In-app purchases (1)**

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


## Frequently asked questions

### Is Planet simulation free?

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

### Is Atom Fusion free?

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

### Which has better reviews, Planet simulation or Atom Fusion?

Atom Fusion is rated higher. Planet simulation averages 3.9 out of 5 from 164 ratings, while Atom Fusion averages 4.3 from 6 ratings.

### Do Planet simulation or Atom Fusion have ads?

Planet simulation shows ads; Atom Fusion does not.

### Which is updated more often, Planet simulation or Atom Fusion?

Planet simulation ships an update every 7 months, and Atom Fusion every 5 days. Most recently, Planet simulation was updated on September 28, 2026 and Atom Fusion on September 15, 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.*