Universe Size Comparison vs Solar System Viewer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Universe Size Comparison
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.
- 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
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Universe Size Comparison is a unique 3D astronomical app that will make you understand the real dimensions of the universe and how small we are. Have you ever wondered how big the Sun is compared to Earth? Or what is the largest planet between Mars and Earth? Do you want to find out the dimensions of some of the most famous stars in the sky like Rigel and Betelgeuse in comparison to our Sun? Do you want to compare everything with the hypergiant star VY Canis Majoris? Universe Size Comparison is the right app for you. The app offers two modes: Tour Mode and Free Mode. Tour mode will guide you on a spectacular journey where you will see planets and stars compared in full scale. All accompanied by simple and clear explanations regardless of the level of knowledge of the subject. The Free mode will allow you to compare two celestial bodies of your choice in scale. You will also find out more information on the bodies you are comparing thanks to an elegant user interface designed to offer the maximum user experience.
Solar System Viewer
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.
- Simulate planetary orbits
- Adjust time speed
- Time travel to specific dates
- Home screen widgets
- Apple Watch integration
- View planet overviews
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8Planets is a simple viewer and simulator for planetary orbits in our Solar System. 8Planets helps you discover how the planets aligned and move around over time so that you feel the scale of the Solar System or even the Universe. By giving you quick and easy access to the Solar System everywhere, 8Planets will make you feel that the Solar System is close to us. FEATURES ・Planetary Motion Speed up or slow down time to see how the planets rotate over time and grasp the scale of the Solar System. ・Time Travel Travel back or forward in time to view the Solar System or planetary positions on any given date. ・Widgets Widgets allow you to display the real-time Solar System on your Home Screen. ・Watch View the Solar System on your wrist and use Digital Crown to travel back or forward in time. ・Others Apple Watch Complications, Overview of the planets, Option to show Pluto, Sharing your favorite moment of the Solar System, URL Scheme, and more.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Universe Size Comparison | Solar System Viewer |
|---|---|---|
| Price | $1.99 — better | $2.99 |
| Rating | 3.2 (30 ratings) | 4.4 (28 ratings) — better |
| Positive reviews | 70.0% of reviews | 83.3% of reviews — better |
| Number of ratings | 30 — better | 28 |
| Update frequency | Every 3 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, Apple TV | iPhone, iPad, Mac, Apple Watch — better |
| Requires iOS | 17.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 411 MB | 22 MB |
| Age rating | +4 | 4+ |
| Developer | Daniele Citi | BLUE COMET LABS LLC |
Customer experience
Universe Size Comparison
Solar System Viewer
In-app purchases
Universe Size Comparison
No in-app purchases
Solar System Viewer
- Io Tip$1.99
- Europa Tip$3.99
- Ganymede Tip$5.99
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- Callisto Tip$9.99
Questions
Is Universe Size Comparison free?
Is Solar System Viewer free?
Which has better reviews, Universe Size Comparison or Solar System Viewer?
Do Universe Size Comparison or Solar System Viewer have ads?
Which is updated more often, Universe Size Comparison or Solar System Viewer?
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