# SizeChina vs Intergalactic Solar System

The clearest difference is in-app purchases: SizeChina at none against Intergalactic Solar System's 1. Intergalactic Solar System's advantage is update cadence (monthly vs every 60 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Intergalactic Solar System sells 1 one-off in-app purchase. SizeChina asks for nothing beyond the download.

SizeChina ships an update every 60 months, Intergalactic Solar System monthly. The most recent releases landed on October 11, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | SizeChina | Intergalactic Solar System |
| --- | --- | --- |
| Price | Free | 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 60 months | **Monthly** |
| Monetization | — | Free with in-app purchases |
| Size | 23 MB | 355 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Apps Resource Centre, Hong Kong Baptist University](https://appshunter.io/developer/1375410542) | [Intergalactic Education LLC](https://appshunter.io/developer/1364648815) |

## What reviewers say

### SizeChina

[App page](https://appshunter.io/ios/app/sizechina/id1481186588)

**Features:** macOS Compatibility

**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 SizeChina free?

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

### Is Intergalactic Solar System free?

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

### Do SizeChina or Intergalactic Solar System have ads?

Neither SizeChina nor Intergalactic Solar System shows ads.

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

SizeChina ships an update every 60 months, and Intergalactic Solar System monthly. Most recently, SizeChina was updated on October 11, 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.*