# Interactive Solar System vs Universe Size Comparison

The clearest difference is update cadence: Interactive Solar System at fortnightly against Universe Size Comparison's every 4 months. Universe Size Comparison's advantage is device support (4 vs 2). On price, ads, in-app purchases and iOS requirement there is nothing between them.

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

Interactive Solar System ships an update fortnightly, Universe Size Comparison every 4 months. The most recent releases landed on September 18, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Interactive Solar System | Universe Size Comparison |
| --- | --- | --- |
| Price | $1.99 | $1.99 |
| Rating | — | **[3.1 (29 ratings)](https://appshunter.io/ios/app/universe-size-comparison/id1473946290/reviews)** |
| Number of ratings | — | **29** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 4 months |
| Monetization | — | Paid |
| Size | 52 MB | 411 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPad, Apple TV | **iPhone, iPad, iPod, Apple TV** |
| Age rating | 4+ | 4+ |
| Developer | [Ventura Educational Systems](https://appshunter.io/developer/371324172) | [Daniele Citi](https://appshunter.io/developer/1187632258) |

## What reviewers say

### Interactive Solar System

[App page](https://appshunter.io/ios/app/interactive-solar-system/id1240878228)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Interactive Solar System free?

Interactive Solar System costs $1.99, with no in-app purchases.

### Is Universe Size Comparison free?

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

### Do Interactive Solar System or Universe Size Comparison have ads?

Neither Interactive Solar System nor Universe Size Comparison shows ads.

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

Interactive Solar System ships an update fortnightly, and Universe Size Comparison every 4 months. Most recently, Interactive Solar System was updated on September 18, 2026 and Universe Size Comparison on September 15, 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.*