# Scale of U — The size of everything

> The size of everything (iPhone/iPad app by Grossard Education.)

- Source: https://appshunter.io/ios/app/scale-of-u/id6817622989 (this page in markdown: same URL + `.md`)
- Developer: [Grossard Education](https://appshunter.io/developer/6815946214)
- Category: Education, Reference
- Price: Free
- Age rating: 4+
- Requires: iOS 18.0 · 9 MB
- Languages: American English
- Released: 2026-10-13
- Data updated: 2026-10-24

## What is Scale of U?

Scale of U draws everything at its true relative size, from a proton to the observable universe. Pinch to zoom and travel across 42 powers of ten: atoms and molecules, insects, people and animals, everyday objects, moons and planets, stars and galaxies.

What you can do
• Explore 161 objects in 3D, from the proton and the hydrogen atom to the Milky Way and the observable universe
• Zoom smoothly from 10⁻¹⁵ to 10²⁷ meters with a pinch, the slider, the scale buttons or a keyboard
• Tap any object to center it, turn it in 3D and read what its size measures
• Compare two objects side by side at one shared scale, such as Earth and the Moon or a honeybee and a grain of sand
• Walk through ten categories in size order: everyday objects, the solar system, worlds, moons, exoplanets, stars, galaxies, insects, molecules and elements
• Take a guided tour from tiny to vast, at your own pace
• See NASA surface maps and Hubble photographs, each with its credit

Made for classrooms and curious people
• Free, with no ads, no accounts and no data collection
• Designed for iPad and iPhone, in landscape or portrait, and in Split View
• 3D models download as you explore and in the background on Wi-Fi, so the app works offline once they are stored. Until then, every object shows a picture.

Honest about sizes
Every object says what its number measures: a diameter, a length, a wingspan or an orbit. Sources are listed for each one. Models are schematic where no photograph exists.

Scale of U is also on the web at scaleofu.com. Made by Grossard Education.

## Is Scale of U safe?

Not enough ratings yet to assess Scale of U.

## Is Scale of U legit?

Scale of U has limited verification signals. The AppsHunter Legitimacy Score for Scale of U is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 3 releases)

### 1.0.2 — 2026-10-22

Swipe up or down on the background to explore larger or smaller objects. Pinch zoom and dragging a model to rotate still work.

### 1.0.1 — 2026-10-22

A new World within icon for Scale of U: a tiny world inside a much larger one.

### 1.0.0 — 2026-10-13

No release notes.

## Apps similar to Scale of U

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [CosmoSize: Space to Scale](https://appshunter.io/ios/app/cosmosize-space-to-scale/id6804750214) | 5.0 (3) | Free | Education |
| [ScaleWalk](https://appshunter.io/ios/app/scalewalk/id6793884701) | 3.0 (1) | Free | Education |
| [COSMOS: Solar System Explorer](https://appshunter.io/ios/app/cosmos-solar-system-explorer/id6773522707) | — | Free | Education |
| [Universe in Light-Years](https://appshunter.io/ios/app/universe-in-light-years/id6808345182) | — | Free | Education |
| [EarthPhase](https://appshunter.io/ios/app/earthphase/id6759940394) | 5.0 (3) | Free | Education |
| [10k Science](https://appshunter.io/ios/app/10k-science/id6793177913) | 5.0 (2) | Free | Education |

## More apps by Grossard Education

- [Duck Day](https://appshunter.io/ios/app/duck-day/id6815946212)
- [Sketchmore](https://appshunter.io/ios/app/sketchmore/id6818376925)

All apps by Grossard Education: https://appshunter.io/developer/6815946214

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-24.*