Universal Zoom vs Stars Units Sizes Objects
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
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 Universal Zoom's $5.99. Stars Units Sizes Objects also leads on iOS requirement (11.0 vs 15.5). Universal Zoom's advantage is rating (4.8 vs 4.2) and ads (none vs shown). 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; Universal Zoom costs $5.99 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 4.2. That said, the two scores are not equally well evidenced: Universal Zoom has 363 ratings behind it against 5, 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 80% of Stars Units Sizes Objects's.
Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on October 21, 2026 and September 22, 2026 respectively.
| Parameter | Universal Zoom | Stars Units Sizes Objects |
|---|---|---|
| Price | $5.99 | Free — better |
| Rating | 4.8 (363 ratings) — better | 4.2 (5 ratings) |
| Positive reviews | 96.7% of reviews — better | 80.0% of reviews |
| Number of ratings | 363 — better | 5 |
| Update frequency | Every 4 months | Every 4 months |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Paid | Ad-supported — better |
| Best chart rank | #129 — better | — |
| Devices | iPhone, iPad, iPod, Apple TV — better | iPhone, iPad, iPod |
| Requires iOS | 15.5 | 11.0 — better |
| Further details — not scored | ||
| Size | 175 MB | 124 MB |
| Age rating | 4+ | 4+ |
| Developer | GamifyIt | Mudarmeen Munlin |
Customer experience
Universal Zoom
Stars Units Sizes Objects
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
Stars Units Sizes Objects
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Universal Zoom
No in-app purchases
Stars Units Sizes Objects
No in-app purchases
Questions
Is Universal Zoom free?
Is Stars Units Sizes Objects free?
Which has better reviews, Universal Zoom or Stars Units Sizes Objects?
Do Universal Zoom or Stars Units Sizes Objects have ads?
Which is updated more often, Universal Zoom or Stars Units Sizes Objects?
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