# Universal Zoom vs Stars Units Sizes Objects

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.

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.

## The numbers

| Metric | Universal Zoom | Stars Units Sizes Objects |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| Rating | **[4.8 (363 ratings)](https://appshunter.io/ios/app/universal-zoom-science-guide/id807673066/reviews)** | [4.2 (5 ratings)](https://appshunter.io/ios/app/stars-units-sizes-objects/id1576148571/reviews) |
| Number of ratings | **363** | 5 |
| Positive reviews | **96.7% of reviews** | 80.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | Every 4 months |
| Monetization | Paid | **Ad-supported** |
| Best chart rank | **#197** | — |
| Size | 175 MB | 124 MB |
| Requires iOS | 15.5 | **11.0** |
| Devices | **iPhone, iPad, iPod, Apple TV** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [GamifyIt](https://appshunter.io/developer/807673069) | [Mudarmeen Munlin](https://appshunter.io/developer/1348165664) |

## What reviewers say

### Universal Zoom

[App page](https://appshunter.io/ios/app/universal-zoom-science-guide/id807673066)

**Currently charting:** #197 Top Paid · Education (US App Store)

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.

**Highlights:** Seamless zooming across scales, Visual comparisons of objects, Jargon-free scientific explanations, Audio narration, Over 270 objects presented to scale, Multi-language support

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Fascinating and informative
- 🚀 Smooth and seamless experience
- 💡 Puts things into perspective
- 👍 Great learning tool for all ages
- 👍 Visually appealing and well-designed

**What reviewers complain about**

- 🐛 Occasional bugs and crashes
- 🔋 High battery consumption
- 🔇 Background music could be improved

**Reported bugs**

- Incorrect information for some objects
- Compatibility issues on older devices
- Typos and minor errors in text

**Requested features**

- 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

[App page](https://appshunter.io/ios/app/stars-units-sizes-objects/id1576148571)

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.

**Highlights:** 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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Universal Zoom free?

Universal Zoom costs $5.99, with no in-app purchases.

### Is Stars Units Sizes Objects free?

Stars Units Sizes Objects is free to download, with no in-app purchases.

### Which has better reviews, Universal Zoom or Stars Units Sizes Objects?

Universal Zoom is rated higher. Universal Zoom averages 4.8 out of 5 from 363 ratings, while Stars Units Sizes Objects averages 4.2 from 5 ratings.

### Do Universal Zoom or Stars Units Sizes Objects have ads?

Stars Units Sizes Objects shows ads; Universal Zoom does not.

### Which is updated more often, Universal Zoom or Stars Units Sizes Objects?

Universal Zoom ships an update every 4 months, and Stars Units Sizes Objects every 4 months. Most recently, Universal Zoom was updated on October 21, 2026 and Stars Units Sizes Objects on September 22, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*