Universe Size Comparison vs Pocket Planets
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.
Pocket Planets
Explore our solar system with detailed information on planets, moons, and astronauts. Track who is currently in space and receive notifications for new launches. Access NASA images and compare celestial body characteristics.
- Detailed planet and moon data
- Astronaut information and missions
- Real-time space occupancy
- Launch notifications
- NASA image gallery
- Celestial body comparisons
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Pocket Planets gives you all the information you need about our solar system and human activity in space. Learn more about all 565 astronauts who been to space. What was their mission? How long had they been up there? See who is in space now! Get notified when somebody goes into space. Get up to date information about every planet and moon in the solar system. Including: - Physical characteristics: mass, radius, density, gravity, escape velocity - Orbital characteristics: real-time distance from the Sun and Earth, orbital period, orbital speed, eccentricity, apsis, periapsis, visualise orbit - Atmosphere: pressure, atmospheric composition - Images from Nasa - Moons: compare their size and distance
Screenshots
Verdict
The clearest difference is price: Pocket Planets at Free against Universe Size Comparison's $1.99. Pocket Planets also leads on rating (4.6 vs 3.2) and update cadence (every 3 weeks vs every 3 months). Universe Size Comparison's advantage is ads (none vs shown). On review sentiment, ratings volume, in-app purchases and device support 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
Pocket Planets is free to download; Universe Size Comparison costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Pocket Planets holds the better App Store score, 4.6 against 3.2. Both are backed by a comparable volume of ratings — 30 and 22 respectively. Written reviews complicate that: 70% of Universe Size Comparison's written reviews are positive against 67% of Pocket Planets'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, Pocket Planets every 3 weeks. The most recent releases landed on November 3, 2026 and October 24, 2026 respectively.
| Parameter | Universe Size Comparison | Pocket Planets |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 3.2 (30 ratings) | 4.6 (22 ratings) — better |
| Positive reviews | 70.0% of reviews — better | 66.7% of reviews |
| Number of ratings | 30 — better | 22 |
| Update frequency | Every 3 months | Every 3 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Paid | Ad-supported — better |
| Devices | iPhone, iPad, Apple TV | iPhone, iPad, iPod |
| Requires iOS | 17.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 411 MB | 66 MB |
| Age rating | +4 | 4+ |
| Developer | Daniele Citi | Ad Lunam Kereskedelmi es Szolgaltato Korlatolt Felelossegu Tarsasag |
Customer experience
Universe Size Comparison
Pocket Planets
In-app purchases
Universe Size Comparison
No in-app purchases
Pocket Planets
No in-app purchases
Questions
Is Universe Size Comparison free?
Is Pocket Planets free?
Which has better reviews, Universe Size Comparison or Pocket Planets?
Do Universe Size Comparison or Pocket Planets have ads?
Which is updated more often, Universe Size Comparison or Pocket Planets?
Other comparisons
