# Universe Size Comparison vs Solar System Viewer

The clearest difference is rating: Solar System Viewer at 4.4 against Universe Size Comparison's 3.2. Solar System Viewer also leads on review sentiment (83% vs 70%). Universe Size Comparison's advantage is in-app purchases (none vs 4) and price ($1.99 vs $2.99). On ratings volume, update cadence, ads and monetization model there is nothing between them.

Universe Size Comparison costs $1.99 and Solar System Viewer $2.99 up front. Solar System Viewer sells 4 one-off in-app purchases. Universe Size Comparison asks for nothing beyond the download.

Solar System Viewer holds the better App Store score, 4.4 against 3.2. Both are backed by a comparable volume of ratings — 30 and 28 respectively. Written reviews point the same way: 70% of Universe Size Comparison's written reviews are positive against 83% of Solar System Viewer's.

Universe Size Comparison ships an update every 3 months, Solar System Viewer every 2 months. The most recent releases landed on November 3, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Universe Size Comparison | Solar System Viewer |
| --- | --- | --- |
| Price | **$1.99** | $2.99 |
| Rating | [3.2 (30 ratings)](https://appshunter.io/ios/app/universe-size-comparison/id1473946290/reviews) | **[4.4 (28 ratings)](https://appshunter.io/ios/app/solar-system-viewer-8planets/id1554639445/reviews)** |
| Number of ratings | **30** | 28 |
| Positive reviews | 70.0% of reviews | **83.3% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Paid | Paid |
| Size | 411 MB | 22 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | iPhone, iPad, Apple TV | **iPhone, iPad, Mac, Apple Watch** |
| Age rating | +4 | 4+ |
| Developer | [Daniele Citi](https://appshunter.io/developer/1187632258) | [BLUE COMET LABS LLC](https://appshunter.io/developer/1492055170) |

## 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


### Solar System Viewer

[App page](https://appshunter.io/ios/app/solar-system-viewer-8planets/id1554639445)

Explore and simulate the orbits of planets in our solar system. This app allows you to speed up or slow down time, travel to any date, and view planetary positions. It also offers widgets for your home screen and Apple Watch complications.

**Highlights:** Simulate planetary orbits, Adjust time speed, Time travel to specific dates, Home screen widgets, Apple Watch integration, View planet overviews

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Io Tip | $1.99 | one-time |
| Europa Tip | $3.99 | one-time |
| Ganymede Tip | $5.99 | one-time |
| Callisto Tip | $9.99 | one-time |


## Frequently asked questions

### Is Universe Size Comparison free?

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

### Is Solar System Viewer free?

Solar System Viewer costs $2.99, and also offers in-app purchases.

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

Solar System Viewer is rated higher. Universe Size Comparison averages 3.2 out of 5 from 30 ratings, while Solar System Viewer averages 4.4 from 28 ratings.

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

Neither Universe Size Comparison nor Solar System Viewer shows ads.

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

Universe Size Comparison ships an update every 3 months, and Solar System Viewer every 2 months. Most recently, Universe Size Comparison was updated on November 3, 2026 and Solar System Viewer on November 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.*