Universal Zoom vs Universe Size Comparison
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Universal Zoom
Explore the universe's vastness and intricacy through interactive visual comparisons. Seamlessly zoom from subatomic particles to the observable universe, gaining intuition about scale and size with stunning imagery and clear explanations.
- Seamless zooming across scales
- Visual comparisons of objects
- Jargon-free scientific explanations
- Audio narration
- Over 270 objects presented to scale
- Multi-language support
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The universe is endlessly vast. A single atom is impossibly small. And somewhere between those two extremes lies everything that has ever existed. We believe that feeling — the electric, spine-tingling sense of scale — belongs to everyone. Not just scientists. Not just students. Everyone. That's why we built Universal Zoom. WHAT YOU CAN DO • Zoom seamlessly from the Planck length to the edge of the observable universe — about 300 objects presented to perfect scale. • Compare any two objects side by side: how many Earths fit inside Jupiter? How does a virus measure up against a skyscraper? Instant, visual, intuitive. (No other scale app lets you do this.) • Go deeper with audio narration and short, accessible explanations — the facts that matter, in plain language. WHAT YOU'LL EXPLORE • Elementary particles — quarks, leptons, and bosons. Atomic nuclei, atoms, and DNA. Living cells. Animals and landmarks. Planets, stars, and galaxies. A deep dive into physics, biology, and astronomy — with short, plain-language articles that make even particle physics easy to grasp — in 40 languages, with metric, imperial, or powers-of-ten units. • Real high-resolution photos and electron microscope images, where possible. Original artwork for things that can't be photographed — like elementary particles and DNA structures. • No ads. No in-app purchases. Pure discovery. BUILT WITH YOU We're a team of two (Andrey and Oksana) from Canada who have poured a decade into this app because we genuinely love science. Most objects come from community suggestions — carefully fact-checked and updated with every new discovery. Over 200 more are already in the queue. FOR EDUCATORS Used by teachers worldwide to visualize scale, build measurement intuition, and turn abstract numbers into "aha" moments. Available at 50% off for schools via Apple School Manager (20+ copies). FOLLOW THE JOURNEY Sneak peeks and upcoming additions: @gamifyitapps on X, YouTube, and TikTok. Feedback and ideas: gamifyitapps.com/contact
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.
Screenshots
Verdict
The clearest difference is rating: Universal Zoom at 4.8 against Universe Size Comparison's 3.2. Universal Zoom also leads on review sentiment (97% vs 70%) and ratings volume (366 vs 30). Universe Size Comparison's advantage is price ($1.99 vs $5.99). On update cadence, ads, in-app purchases 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
Universal Zoom costs $5.99 and Universe Size Comparison $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Universal Zoom holds the better App Store score, 4.8 against 3.2. That said, the two scores are not equally well evidenced: Universal Zoom has 366 ratings behind it against 30, so its average is the more settled of the two. Written reviews point the same way: 97% of Universal Zoom's written reviews are positive against 70% of Universe Size Comparison's.
Universal Zoom ships an update every 4 months, Universe Size Comparison every 3 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.
| Parameter | Universal Zoom | Universe Size Comparison |
|---|---|---|
| Price | $5.99 | $1.99 — better |
| Rating | 4.8 (366 ratings) — better | 3.2 (30 ratings) |
| Positive reviews | 96.7% of reviews — better | 70.0% of reviews |
| Number of ratings | 366 — better | 30 |
| Update frequency | Every 4 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod, Apple TV — better | iPhone, iPad, Apple TV |
| Requires iOS | 15.5 — better | 17.0 |
| Further details — not scored | ||
| Size | 175 MB | 411 MB |
| Age rating | 4+ | +4 |
| Developer | GamifyIt | Daniele Citi |
Customer experience
Universal Zoom
Universe Size Comparison
Bugs and requests
Universal Zoom
Reported bugs
3 issues- Incorrect information for some objects
- Compatibility issues on older devices
- Typos and minor errors in text
Requested features
5 requests- Add more objects and comparisons
- Customizable object feature
- Support for more languages
- Ability to toggle between metric and imperial units
- Search and filtering options
Universe Size Comparison
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Universal Zoom
No in-app purchases
Universe Size Comparison
No in-app purchases
Questions
Is Universal Zoom free?
Is Universe Size Comparison free?
Which has better reviews, Universal Zoom or Universe Size Comparison?
Do Universal Zoom or Universe Size Comparison have ads?
Which is updated more often, Universal Zoom or Universe Size Comparison?
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