# Universe Size Comparison vs Kids Solar System Adventure

The clearest difference is rating: Kids Solar System Adventure at 3.8 against Universe Size Comparison's 3.1. Kids Solar System Adventure also leads on update cadence (every 2 weeks vs every 4 months) and iOS requirement (10.0 vs 13.0). Universe Size Comparison's advantage is review sentiment (67% vs 50%) and ratings volume (29 vs 5). On ads, in-app purchases, monetization model and device support there is nothing between them.

Universe Size Comparison costs $1.99 and Kids Solar System Adventure $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Kids Solar System Adventure holds the better App Store score, 3.8 against 3.1. That said, the two scores are not equally well evidenced: Universe Size Comparison has 29 ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 67% of Universe Size Comparison's written reviews are positive against 50% of Kids Solar System Adventure's, so the app with the better star average is not the one people write more warmly about.

Universe Size Comparison ships an update every 4 months, Kids Solar System Adventure every 2 weeks. The most recent releases landed on September 15, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Universe Size Comparison | Kids Solar System Adventure |
| --- | --- | --- |
| Price | **$1.99** | $3.99 |
| Rating | [3.1 (29 ratings)](https://appshunter.io/ios/app/universe-size-comparison/id1473946290/reviews) | **[3.8 (5 ratings)](https://appshunter.io/ios/app/kids-solar-system-adventure/id1507857504/reviews)** |
| Number of ratings | **29** | 5 |
| Positive reviews | **66.7% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Monetization | Paid | Paid |
| Size | 411 MB | 97 MB |
| Requires iOS | 13.0 | **10.0** |
| Devices | **iPhone, iPad, iPod, Apple TV** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Daniele Citi](https://appshunter.io/developer/1187632258) | [Ameer Moosa](https://appshunter.io/developer/611675070) |

## What reviewers say

### Universe Size Comparison

[App page](https://appshunter.io/ios/app/universe-size-comparison/id1473946290)

Explore the vastness of space and understand celestial body dimensions through interactive 3D comparisons. Discover the scale of planets and stars, from our Sun to hypergiant stars, with guided tours and free comparison modes.

**Highlights:** 3D astronomical comparisons, Tour Mode with guided explanations, Free Mode for custom comparisons, Scale comparisons of planets and stars, Detailed celestial body information, Elegant user interface

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

**In-app purchases:** none


### Kids Solar System Adventure

[App page](https://appshunter.io/ios/app/kids-solar-system-adventure/id1507857504)

This educational game introduces young children to the solar system through interactive play. It helps toddlers learn planet names, spelling, and alphabets in multiple languages. The app features puzzles, sound effects, and customizable reading speeds for an engaging learning experience.

**Highlights:** Learn planet names and spelling, Multilingual support (6 languages), Interactive planet puzzles, Real sound effects, Customizable reading speed, Decorate planets

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Universe Size Comparison free?

Universe Size Comparison costs $1.99, with no in-app purchases.

### Is Kids Solar System Adventure free?

Kids Solar System Adventure costs $3.99, with no in-app purchases.

### Which has better reviews, Universe Size Comparison or Kids Solar System Adventure?

Kids Solar System Adventure is rated higher. Universe Size Comparison averages 3.1 out of 5 from 29 ratings, while Kids Solar System Adventure averages 3.8 from 5 ratings.

### Do Universe Size Comparison or Kids Solar System Adventure have ads?

Neither Universe Size Comparison nor Kids Solar System Adventure shows ads.

### Which is updated more often, Universe Size Comparison or Kids Solar System Adventure?

Universe Size Comparison ships an update every 4 months, and Kids Solar System Adventure every 2 weeks. Most recently, Universe Size Comparison was updated on September 15, 2026 and Kids Solar System Adventure on September 23, 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.*