# Johannes Kepler vs Intergalactic Solar System

The clearest difference is price: Intergalactic Solar System at Free against Johannes Kepler's $1.99. Intergalactic Solar System also leads on update cadence (monthly vs every 10 months) and iOS requirement (13.0 vs 15.6). Johannes Kepler's advantage is in-app purchases (none vs 1). On ads and device support there is nothing between them.

Intergalactic Solar System is free to download; Johannes Kepler costs $1.99 up front. Intergalactic Solar System sells 1 one-off in-app purchase. Johannes Kepler asks for nothing beyond the download.

Johannes Kepler ships an update every 10 months, Intergalactic Solar System monthly. The most recent releases landed on October 24, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Johannes Kepler | Intergalactic Solar System |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | — | **[4.0 (25 ratings)](https://appshunter.io/ios/app/intergalactic-solar-system/id1505399254/reviews)** |
| Number of ratings | — | **25** |
| Positive reviews | — | 70.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | **Monthly** |
| Monetization | — | Free with in-app purchases |
| Size | 49 MB | 355 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPad, Mac, Apple TV | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ventura Educational Systems](https://appshunter.io/developer/371324172) | [Intergalactic Education LLC](https://appshunter.io/developer/1364648815) |

## What reviewers say

### Johannes Kepler

[App page](https://appshunter.io/ios/app/johannes-kepler/id1456789915)

**Features:** Vision Pro support

**In-app purchases:** none


### Intergalactic Solar System

[App page](https://appshunter.io/ios/app/intergalactic-solar-system/id1505399254)

Explore planets, moons, and countries in this space simulator mini-game. Learn astronomy and geography aligned with next-generation science standards. Discover the Milky Way galaxy and assess your knowledge through engaging gameplay.

**Highlights:** Planet and moon exploration, Country geography learning, Milky Way galaxy view, Common Core aligned curriculum, Proficiency assessment, Engaging gameplay levels

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Access to Full Game | $3.99 | one-time |


## Frequently asked questions

### Is Johannes Kepler free?

Johannes Kepler costs $1.99, with no in-app purchases.

### Is Intergalactic Solar System free?

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

### Do Johannes Kepler or Intergalactic Solar System have ads?

Neither Johannes Kepler nor Intergalactic Solar System shows ads.

### Which is updated more often, Johannes Kepler or Intergalactic Solar System?

Johannes Kepler ships an update every 10 months, and Intergalactic Solar System monthly. Most recently, Johannes Kepler was updated on October 24, 2026 and Intergalactic Solar System on October 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.*