# Solar System Sim vs Kat Game

The clearest difference is in-app purchases: Kat Game at none against Solar System Sim's 5. Kat Game also leads on ads (none vs shown). Solar System Sim's advantage is update cadence (every 4 days vs monthly). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Solar System Sim sells 5 one-off in-app purchases. Kat Game asks for nothing beyond the download.

Solar System Sim ships an update every 4 days, Kat Game monthly. The most recent releases landed on October 15, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Solar System Sim | Kat Game |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (4.3K ratings)](https://appshunter.io/ios/app/solar-system-sim/id6447612221/reviews)** | — |
| Number of ratings | **4.3K** | — |
| Positive reviews | 80.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 4 days** | Monthly |
| Monetization | Free with in-app purchases | — |
| Size | 532 MB | 15 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [WPC](https://appshunter.io/developer/1681830786) | [Dale LaPlante](https://appshunter.io/developer/1437961207) |

## What reviewers say

### Solar System Sim

[App page](https://appshunter.io/ios/app/solar-system-sim/id6447612221)

Simulate and explore celestial bodies within our solar system and beyond. Create your own solar systems, experiment with gravity and physics, and observe orbital mechanics in action.

**Highlights:** Explore planets and moons, Visit nearby stars, Create custom solar systems, Gravity and physics simulation, Recalculate orbits, Newton's laws implementation

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HD Mars | $2.99 | one-time |
| HD Earth | $2.99 | one-time |
| HD Moon | $2.99 | one-time |
| No-ads | $3.99 | one-time |
| HD 3-body pack | $6.99 | one-time |

**What reviewers like**

- 🚀 Realistic simulation
- 🚀 Detailed solar system
- 🚀 Ability to create custom solar systems
- 🚀 Impressive graphics
- 🚀 Frequent updates

**What reviewers complain about**

- 🐛 Crashes and glitches
- 🔋 High battery consumption
- 💰 Excessive ads
- 🐛 Saving and loading issues
- 🐛 Unstable orbits

**Reported bugs**

- Planets/moons disappearing after saving and loading
- Bright flashes and screen distortions
- Planets/objects getting stuck inside stars
- Crashes when colliding or editing certain objects
- Inconsistent orbital mechanics and moons ejecting from planets

**Requested features**

- Add more galaxy and nebula textures
- Implement realistic supernova effects
- Allow customization of planet atmospheres and terrain
- Add binary star systems and rogue planets
- Introduce a galaxy maker and collision feature


### Kat Game

[App page](https://appshunter.io/ios/app/kat-game/id6749801159)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Solar System Sim free?

Solar System Sim is free to download, with in-app purchases available.

### Is Kat Game free?

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

### Do Solar System Sim or Kat Game have ads?

Solar System Sim shows ads; Kat Game does not.

### Which is updated more often, Solar System Sim or Kat Game?

Solar System Sim ships an update every 4 days, and Kat Game monthly. Most recently, Solar System Sim was updated on October 15, 2026 and Kat Game on October 6, 2026.

---

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