# Stars Units Sizes Objects vs Univerzoom 2D Size Comparison

The clearest difference is in-app purchases: Stars Units Sizes Objects at none against Univerzoom 2D Size Comparison's 3. Stars Units Sizes Objects also leads on iOS requirement (11.0 vs 13.0). Univerzoom 2D Size Comparison's advantage is ads (none vs shown) and update cadence (weekly vs every 4 months). On price and device support there is nothing between them.

Both are free to download. Univerzoom 2D Size Comparison sells 3 one-off in-app purchases. Stars Units Sizes Objects asks for nothing beyond the download.

Univerzoom 2D Size Comparison holds the better App Store score, 4.6 against 4.3. That said, the two scores are not equally well evidenced: Univerzoom 2D Size Comparison has 77 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 80% of Stars Units Sizes Objects's written reviews are positive against 100% of Univerzoom 2D Size Comparison's.

Stars Units Sizes Objects ships an update every 4 months, Univerzoom 2D Size Comparison weekly. The most recent releases landed on November 3, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Stars Units Sizes Objects | Univerzoom 2D Size Comparison |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (6 ratings)](https://appshunter.io/ios/app/stars-units-sizes-objects/id1576148571/reviews) | **[4.6 (77 ratings)](https://appshunter.io/ios/app/univerzoom-2d-size-comparison/id1598332779/reviews)** |
| Number of ratings | 6 | **77** |
| Positive reviews | 80.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Weekly** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 124 MB | 254 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Mudarmeen Munlin](https://appshunter.io/developer/1348165664) | [Linda Schnetzinger](https://appshunter.io/developer/1479825448) |

## What reviewers say

### 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, Vision Pro support

**In-app purchases:** none


### Univerzoom 2D Size Comparison

[App page](https://appshunter.io/ios/app/univerzoom-2d-size-comparison/id1598332779)

Explore the relative sizes of everyday objects with minimalist visual comparisons. Create and share custom comparisons of vehicles, animals, landmarks, and more to understand their true dimensions. Perfect for students, educators, and anyone curious about scale.

**Highlights:** Create custom size comparisons, Explore terrestrial object categories, Visualize dimensions in orthogonal perspective, Customize comparisons with an easy interface, Save and share visual references

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade to Complete Collection | $1.99 | one-time |
| Premium Unlock | $1.99 | one-time |
| Complete Collection | $3.99 | one-time |


## Frequently asked questions

### Is Stars Units Sizes Objects free?

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

### Is Univerzoom 2D Size Comparison free?

Univerzoom 2D Size Comparison is free to download, with in-app purchases available.

### Which has better reviews, Stars Units Sizes Objects or Univerzoom 2D Size Comparison?

Univerzoom 2D Size Comparison is rated higher. Stars Units Sizes Objects averages 4.3 out of 5 from 6 ratings, while Univerzoom 2D Size Comparison averages 4.6 from 77 ratings.

### Do Stars Units Sizes Objects or Univerzoom 2D Size Comparison have ads?

Stars Units Sizes Objects shows ads; Univerzoom 2D Size Comparison does not.

### Which is updated more often, Stars Units Sizes Objects or Univerzoom 2D Size Comparison?

Stars Units Sizes Objects ships an update every 4 months, and Univerzoom 2D Size Comparison weekly. Most recently, Stars Units Sizes Objects was updated on November 3, 2026 and Univerzoom 2D Size Comparison on November 7, 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.*