Universe Size Comparison vs Stars Units Sizes Objects
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.
Stars Units Sizes Objects
Explore the vastness of the universe, from the smallest particles to the largest cosmic structures. Compare object sizes, view detailed images, and perform unit conversions across a wide range of astronomical scales. Learn about stars, galaxies, and the incredible distances between them.
- Compare object sizes
- View object images
- Pinch/Zoom and Pan images
- Unit conversion for distances
- Explore scales from Planck length to observable universe
- Learn about stars and galaxies
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Size of the smallest to largest objects and stars. Compare the size of objects in the universe. Object images. Pinch/Zoom image. Pan/Move image. Rotate image. Double tap to reset an image. From the smallest to the largest one. From planck length to observable universe. From Yoctometre, Zeptometre, Attometre, Femtometre, Picometre, Nanometre, Micro, Millimetre, Centimetre, Metre, KiloMetre, Lightyear, Parsecs, Billion Lightyears to 93 Billion Lightyears. Size of objects, particles, atoms, cells, stars and galaxies. Get to know the stars. Get to know the spaces. get to know the universe. How small is this world. How big is the universe. And How great is the creator. How far is the star distance from earth. Two way 18 distance unit conversion. planck length, yoctometer, zeptometer, attometer, femtometer, picometre, nanometre, micrometre, Millimeter, Centimeter, Meter, Kilometer, Inch, Foot, Mile, Astronomical, Lightyear, Parsecs. Perform auto conversion when picker is changed. Share conversion result. Reset unit convertor.
Screenshots
Verdict
The clearest difference is price: Stars Units Sizes Objects at Free against Universe Size Comparison's $1.99. Stars Units Sizes Objects also leads on rating (4.3 vs 3.2) and review sentiment (80% vs 70%). Universe Size Comparison's advantage is ads (none vs shown) and ratings volume (30 vs 6). On update cadence, 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
Stars Units Sizes Objects 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.
Stars Units Sizes Objects holds the better App Store score, 4.3 against 3.2. That said, the two scores are not equally well evidenced: Universe Size Comparison has 30 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 70% of Universe Size Comparison's written reviews are positive against 80% of Stars Units Sizes Objects's.
Universe Size Comparison ships an update every 3 months, Stars Units Sizes Objects every 4 months. The most recent releases landed on October 29, 2026 and October 31, 2026 respectively.
| Parameter | Universe Size Comparison | Stars Units Sizes Objects |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 3.2 (30 ratings) | 4.3 (6 ratings) — better |
| Positive reviews | 70.0% of reviews | 80.0% of reviews — better |
| Number of ratings | 30 — better | 6 |
| Update frequency | Every 3 months — better | Every 4 months |
| 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 | 11.0 — better |
| Further details — not scored | ||
| Size | 411 MB | 124 MB |
| Age rating | +4 | 4+ |
| Developer | Daniele Citi | Mudarmeen Munlin |
Customer experience
Universe Size Comparison
Stars Units Sizes Objects
In-app purchases
Universe Size Comparison
No in-app purchases
Stars Units Sizes Objects
No in-app purchases
Questions
Is Universe Size Comparison free?
Is Stars Units Sizes Objects free?
Which has better reviews, Universe Size Comparison or Stars Units Sizes Objects?
Do Universe Size Comparison or Stars Units Sizes Objects have ads?
Which is updated more often, Universe Size Comparison or Stars Units Sizes Objects?
Other comparisons
