# Isotopolis vs Spaceflight Simulator

The clearest difference is rating: Spaceflight Simulator at 4.8 against Isotopolis's 4.2. Spaceflight Simulator also leads on update cadence (every 9 days vs every 37 months) and ratings volume (98K vs 10). Isotopolis's advantage is in-app purchases (none vs 11) and iOS requirement (10.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. Spaceflight Simulator sells 10 one-off in-app purchases. Isotopolis asks for nothing beyond the download.

Spaceflight Simulator holds the better App Store score, 4.8 against 4.2. That said, the two scores are not equally well evidenced: Spaceflight Simulator has 98K ratings behind it against 10, so its average is the more settled of the two. Written reviews point the same way: 63% of Isotopolis's written reviews are positive against 85% of Spaceflight Simulator's.

Isotopolis ships an update every 37 months, Spaceflight Simulator every 9 days. The most recent releases landed on October 3, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Isotopolis | Spaceflight Simulator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (10 ratings)](https://appshunter.io/ios/app/isotopolis/id1051370087/reviews) | **[4.8 (98K ratings)](https://appshunter.io/ios/app/spaceflight-simulator/id1308057272/reviews)** |
| Number of ratings | 10 | **98K** |
| Positive reviews | 62.5% of reviews | **85.3% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 37 months | **Every 9 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 189 MB | 172 MB |
| Requires iOS | **10.0** | 15.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Brian Winn](https://appshunter.io/developer/487088992) | [Spaceflight Simulator UK Ltd](https://appshunter.io/developer/1308057271) |

## What reviewers say

### Isotopolis

[App page](https://appshunter.io/ios/app/isotopolis/id1051370087)

Explore particle physics by accelerating, steering, and colliding particles to create new isotopes. Learn about the fragmentation process and the table of nuclides through engaging gameplay. This educational game is developed by scientists and students.

**Highlights:** Particle acceleration and steering, Isotope creation and discovery, Learn about fragmentation process, Explore the table of nuclides, Educational gameplay, Developed by scientists and students

**Features:** macOS Compatibility

**In-app purchases:** none


### Spaceflight Simulator

[App page](https://appshunter.io/ios/app/spaceflight-simulator/id1308057272)

Build and launch rockets to explore a realistic, open universe. Experience space exploration with accurate physics and a vast, explorable solar system.

**Highlights:** Build custom rockets, Realistic orbital mechanics, Explore a scaled universe, Visit planets and moons, Open-world space exploration, Real-life physics simulation

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Skins Expansion | $2.99 | one-time |
| Full Version | $3.99 | one-time |
| Redstone + Atlas Pack | $3.99 | one-time |
| Parts Expansion | $4.99 | one-time |
| Infinite Area Expansion | $4.99 | one-time |
| Expansion Bundle | $7.99 | one-time |
| Cheats Expansion | $9.99 | one-time |
| Full Bundle Upgrade | $9.99 | one-time |
| Full Bundle | $11.99 | one-time |
| Full Bundle | $14.99 | one-time |

**What reviewers like**

- 🚀 Realistic physics and space simulation
- 👍 Intuitive controls and easy to learn
- 🚀 Ability to build complex rockets and spacecraft
- 👍 No ads or in-app purchases required to play

**What reviewers complain about**

- 🐛 Occasional bugs and glitches, especially with large rockets
- 🔋 Potential performance issues on older devices
- 🔒 Limited customization and part options in free version
- 🚀 Docking and rendezvous maneuvers can be very challenging

**Reported bugs**

- Rocket parts sometimes clipping through each other
- Occasional freezing or crashing when launching large rockets
- Issues with RCS thrusters firing unexpectedly during docking
- Problems with maintaining stable orbits and transfers

**Requested features**

- Add more planets, moons, and celestial bodies to explore
- Implement a career mode or progression system with challenges
- Allow for more customization of rocket parts and spacecraft
- Improve docking and rendezvous mechanics to make them more accessible
- Add the ability to control individual astronauts and perform EVAs


## Frequently asked questions

### Is Isotopolis free?

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

### Is Spaceflight Simulator free?

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

### Which has better reviews, Isotopolis or Spaceflight Simulator?

Spaceflight Simulator is rated higher. Isotopolis averages 4.2 out of 5 from 10 ratings, while Spaceflight Simulator averages 4.8 from 98K ratings.

### Do Isotopolis or Spaceflight Simulator have ads?

Neither Isotopolis nor Spaceflight Simulator shows ads.

### Which is updated more often, Isotopolis or Spaceflight Simulator?

Isotopolis ships an update every 37 months, and Spaceflight Simulator every 9 days. Most recently, Isotopolis was updated on October 3, 2026 and Spaceflight Simulator on October 16, 2026.

---

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