# pxSat3D vs Stars Units Sizes Objects

The clearest difference is in-app purchases: Stars Units Sizes Objects at none against pxSat3D's 2. Stars Units Sizes Objects also leads on iOS requirement (11.0 vs 13.0). pxSat3D's advantage is ads (none vs shown) and rating (4.5 vs 4.2). On price, ratings volume, update cadence and device support there is nothing between them.

Both are free to download. pxSat3D sells 2 one-off in-app purchases. Stars Units Sizes Objects asks for nothing beyond the download.

pxSat3D holds the better App Store score, 4.5 against 4.2. Both are backed by a comparable volume of ratings — 2 and 5 respectively. Written reviews point the same way: 100% of pxSat3D's written reviews are positive against 80% of Stars Units Sizes Objects's.

pxSat3D ships an update every 3 months, Stars Units Sizes Objects every 4 months. The most recent releases landed on October 2, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | pxSat3D | Stars Units Sizes Objects |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/pxsat3d/id1493707854/reviews)** | [4.2 (5 ratings)](https://appshunter.io/ios/app/stars-units-sizes-objects/id1576148571/reviews) |
| Number of ratings | 2 | **5** |
| Positive reviews | **100.0% of reviews** | 80.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 12 MB | 124 MB |
| Requires iOS | 13.0 | **11.0** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [P'tit Xav](https://appshunter.io/developer/373775246) | [Mudarmeen Munlin](https://appshunter.io/developer/1348165664) |

## What reviewers say

### pxSat3D

[App page](https://appshunter.io/ios/app/pxsat3d/id1493707854)

Visualize real-time satellite orbits around Earth. Explore the density of specific satellite types in orbit. Performance may vary on older devices.

**Highlights:** Real-time satellite tracking, Visualize satellite orbits, Quantify satellite types, Space traffic visualization, Educational space data

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Tip | $0.99 | one-time |
| Tip | $2.99 | one-time |


### 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 pxSat3D free?

pxSat3D is free to download, with in-app purchases available.

### Is Stars Units Sizes Objects free?

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

### Which has better reviews, pxSat3D or Stars Units Sizes Objects?

pxSat3D is rated higher. pxSat3D averages 4.5 out of 5 from 2 ratings, while Stars Units Sizes Objects averages 4.2 from 5 ratings.

### Do pxSat3D or Stars Units Sizes Objects have ads?

Stars Units Sizes Objects shows ads; pxSat3D does not.

### Which is updated more often, pxSat3D or Stars Units Sizes Objects?

pxSat3D ships an update every 3 months, and Stars Units Sizes Objects every 4 months. Most recently, pxSat3D was updated on October 2, 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.*