Universal Zoom vs ScaleWalk
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
ScaleWalk
Explore the vast scale of the universe, from DNA to stars, with interactive logarithmic visuals. Compare objects, access knowledge cards, and follow guided learning paths. Save your discoveries and test your understanding.
- Interactive logarithmic universe exploration
- Object comparison
- Knowledge cards
- Guided learning journeys
- Save discoveries
- Learning tests
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Explore the scale of our universe through an interactive logarithmic world. Move from microscopic DNA to humans, planets, and stars. Compare objects, open knowledge cards, follow guided journeys, save discoveries, and test what you learn.
Screenshots
Verdict
The clearest difference is price: ScaleWalk at Free against Universal Zoom's $5.99. ScaleWalk also leads on iOS requirement (13.0 vs 15.5). Universal Zoom's advantage is rating (4.8 vs 3.0) and ratings volume (365 vs 1). On ads, 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
ScaleWalk 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 3.0. That said, the two scores are not equally well evidenced: Universal Zoom has 365 ratings behind it against 1, so its average is the more settled of the two.
| Parameter | Universal Zoom | ScaleWalk |
|---|---|---|
| Price | $5.99 | Free — better |
| Rating | 4.8 (365 ratings) — better | 3.0 (1 ratings) |
| Positive reviews | 96.7% of reviews | — |
| Number of ratings | 365 — better | 1 |
| Update frequency | Every 4 months | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod, Apple TV — better | iPhone, iPad, iPod |
| Requires iOS | 15.5 | 13.0 — better |
| Further details — not scored | ||
| Size | 175 MB | 21 MB |
| Age rating | 4+ | 4+ |
| Developer | GamifyIt | Dieu Hien Nguyen Thi |
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
ScaleWalk
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Universal Zoom
No in-app purchases
ScaleWalk
No in-app purchases
Questions
Is Universal Zoom free?
Is ScaleWalk free?
Which has better reviews, Universal Zoom or ScaleWalk?
Do Universal Zoom or ScaleWalk have ads?
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