# Stars Units Sizes Objects vs 3D Star Map

The clearest difference is ads: 3D Star Map at none against Stars Units Sizes Objects's shown. 3D Star Map also leads on update cadence (every 2 weeks vs every 4 months) and review sentiment (100% vs 80%). On price, ratings volume, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

3D Star Map holds the better App Store score, 4.4 against 4.2. Both are backed by a comparable volume of ratings — 5 and 9 respectively. Written reviews point the same way: 80% of Stars Units Sizes Objects's written reviews are positive against 100% of 3D Star Map's.

Stars Units Sizes Objects ships an update every 4 months, 3D Star Map every 2 weeks. The most recent releases landed on September 7, 2026 and September 1, 2026 respectively.

## The numbers

| Metric | Stars Units Sizes Objects | 3D Star Map |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (5 ratings)](https://appshunter.io/ios/app/stars-units-sizes-objects/id1576148571/reviews) | **[4.4 (9 ratings)](https://appshunter.io/ios/app/3d-star-map/id6758356924/reviews)** |
| Number of ratings | 5 | **9** |
| Positive reviews | 80.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Monetization | Ad-supported | **Free** |
| Size | 124 MB | 100 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Mudarmeen Munlin](https://appshunter.io/developer/1348165664) | [Alexander Winn](https://appshunter.io/developer/652547902) |

## 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

**In-app purchases:** none


### 3D Star Map

[App page](https://appshunter.io/ios/app/3d-star-map/id6758356924)

Explore over 700 stars in our local star cluster in a 3D space simulation. Zoom, rotate, and learn about neighboring star systems with detailed information available on tap. Perfect for research or satisfying cosmic curiosity.

**Highlights:** 3D space exploration, Over 700 local stars, Detailed star information, Zoom, rotate, and move, Relaxing animations, Educational content

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

**In-app purchases:** none


## Frequently asked questions

### Is Stars Units Sizes Objects free?

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

### Is 3D Star Map free?

3D Star Map is free to download, with no in-app purchases.

### Which has better reviews, Stars Units Sizes Objects or 3D Star Map?

3D Star Map is rated higher. Stars Units Sizes Objects averages 4.2 out of 5 from 5 ratings, while 3D Star Map averages 4.4 from 9 ratings.

### Do Stars Units Sizes Objects or 3D Star Map have ads?

Stars Units Sizes Objects shows ads; 3D Star Map does not.

### Which is updated more often, Stars Units Sizes Objects or 3D Star Map?

Stars Units Sizes Objects ships an update every 4 months, and 3D Star Map every 2 weeks. Most recently, Stars Units Sizes Objects was updated on September 7, 2026 and 3D Star Map on September 1, 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.*