# Intergalactic Solar System vs Stars Units Sizes Objects

The clearest difference is in-app purchases: Stars Units Sizes Objects at none against Intergalactic Solar System's 1. Stars Units Sizes Objects also leads on rating (4.2 vs 4.0) and review sentiment (80% vs 70%). Intergalactic Solar System's advantage is ads (none vs shown) and update cadence (monthly vs every 4 months). On price and device support there is nothing between them.

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

Stars Units Sizes Objects holds the better App Store score, 4.2 against 4.0. That said, the two scores are not equally well evidenced: Intergalactic Solar System has 25 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 70% of Intergalactic Solar System's written reviews are positive against 80% of Stars Units Sizes Objects's.

Intergalactic Solar System ships an update monthly, Stars Units Sizes Objects every 4 months. The most recent releases landed on September 22, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | Intergalactic Solar System | Stars Units Sizes Objects |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (25 ratings)](https://appshunter.io/ios/app/intergalactic-solar-system/id1505399254/reviews) | **[4.2 (5 ratings)](https://appshunter.io/ios/app/stars-units-sizes-objects/id1576148571/reviews)** |
| Number of ratings | **25** | 5 |
| Positive reviews | 70.0% of reviews | **80.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Monthly** | Every 4 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 355 MB | 124 MB |
| Requires iOS | 13.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Intergalactic Education LLC](https://appshunter.io/developer/1364648815) | [Mudarmeen Munlin](https://appshunter.io/developer/1348165664) |

## What reviewers say

### 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 |


### Stars Units Sizes Objects

[App page](https://appshunter.io/ios/app/stars-units-sizes-objects/id1576148571)

Explore the vastness of the universe, from the smallest particles to the largest cosmic structures. Compare object sizes, view detailed images, and perform unit conversions across a wide range of astronomical scales. Learn about stars, galaxies, and the incredible distances between them.

**Highlights:** Compare object sizes, View object images, Pinch/Zoom and Pan images, Unit conversion for distances, Explore scales from Planck length to observable universe, Learn about stars and galaxies

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Intergalactic Solar System free?

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

### Is Stars Units Sizes Objects free?

Stars Units Sizes Objects is free to download, with no in-app purchases.

### Which has better reviews, Intergalactic Solar System or Stars Units Sizes Objects?

Stars Units Sizes Objects is rated higher. Intergalactic Solar System averages 4.0 out of 5 from 25 ratings, while Stars Units Sizes Objects averages 4.2 from 5 ratings.

### Do Intergalactic Solar System or Stars Units Sizes Objects have ads?

Stars Units Sizes Objects shows ads; Intergalactic Solar System does not.

### Which is updated more often, Intergalactic Solar System or Stars Units Sizes Objects?

Intergalactic Solar System ships an update monthly, and Stars Units Sizes Objects every 4 months. Most recently, Intergalactic Solar System was updated on September 22, 2026 and Stars Units Sizes Objects on September 7, 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.*