Universe Size Comparison vs Planetaria
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.
Planetaria
Explore a dynamic 3D model of the Solar System, synchronizing with real-time data to show celestial bodies in orbit. Discover planets, dwarf planets, and moons with detailed surface models. Manipulate time to view past and future solar system configurations.
- Interactive 3D Solar System model
- Real-time celestial body positions
- Detailed 3D surface models
- Explore planets, dwarf planets, and moons
- Time manipulation (past/future)
- AR integration
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Explore the celestial worlds of the Solar System with Planetaria, an interactive 3D simulator experience for iPhone, iPad, and Apple Vision Pro. This dynamic scale model of the Solar System synchronizes with real-time data to display the live positions of celestial bodies in their orbits, along with beautiful and detailed 3D models of their surfaces. On your journey through outer space, you can visit the Sun, the 8 planets, 5 dwarf planets, and over 20 major moons. Entire worlds await your discovery, each with their own individual features and environments. You can also fast-forward or rewind time, and see what the Solar System looks like at any time in the past or future. Photos and 3D models provided by NASA/JPL.
Screenshots
Verdict
The clearest difference is rating: Planetaria at 4.2 against Universe Size Comparison's 3.2. Universe Size Comparison's advantage is review sentiment (70% vs 50%) and price ($1.99 vs $4.99). On ratings volume, update cadence, ads and in-app purchases 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 Planetaria $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Planetaria holds the better App Store score, 4.2 against 3.2. Both are backed by a comparable volume of ratings — 30 and 16 respectively. Written reviews complicate that: 70% of Universe Size Comparison's written reviews are positive against 50% of Planetaria'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 3 months, Planetaria every 5 months. Both last shipped on November 3, 2026.
| Parameter | Universe Size Comparison | Planetaria |
|---|---|---|
| Price | $1.99 — better | $4.99 |
| Rating | 3.2 (30 ratings) | 4.2 (16 ratings) — better |
| Positive reviews | 70.0% of reviews — better | 50.0% of reviews |
| Number of ratings | 30 — better | 16 |
| Update frequency | Every 3 months — better | Every 5 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, Apple TV | iPhone, iPad, Vision Pro |
| Requires iOS | 17.0 | 16.4 — better |
| Further details — not scored | ||
| Size | 411 MB | 510 MB |
| Age rating | +4 | 4+ |
| Developer | Daniele Citi | Joseph Rupertus |
Customer experience
Universe Size Comparison
Planetaria
In-app purchases
Universe Size Comparison
No in-app purchases
Planetaria
No in-app purchases
Questions
Is Universe Size Comparison free?
Is Planetaria free?
Which has better reviews, Universe Size Comparison or Planetaria?
Do Universe Size Comparison or Planetaria have ads?
Which is updated more often, Universe Size Comparison or Planetaria?
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