# Stars Units Sizes Objects vs Orbital Simulator

The clearest difference is rating: Orbital Simulator at 5.0 against Stars Units Sizes Objects's 4.2. Orbital Simulator also leads on update cadence (fortnightly vs every 4 months). On price, ratings volume, ads and in-app purchases there is nothing between them.

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

Orbital Simulator holds the better App Store score, 5.0 against 4.2. Both are backed by a comparable volume of ratings — 5 and 5 respectively.

Stars Units Sizes Objects ships an update every 4 months, Orbital Simulator fortnightly. The most recent releases landed on September 7, 2026 and July 8, 2026 respectively.

## The numbers

| Metric | Stars Units Sizes Objects | Orbital Simulator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (5 ratings)](https://appshunter.io/ios/app/stars-units-sizes-objects/id1576148571/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/orbital-simulator-explorer/id6511195732/reviews)** |
| Number of ratings | 5 | 5 |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 4 months | **Fortnightly** |
| Monetization | Ad-supported | Ad-supported |
| Size | 124 MB | 247 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Mudarmeen Munlin](https://appshunter.io/developer/1348165664) | [Renzo Macedo](https://appshunter.io/developer/1403943580) |

## 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


### Orbital Simulator

[App page](https://appshunter.io/ios/app/orbital-simulator-explorer/id6511195732)

Explore orbital mechanics through interactive simulations and real-time solar system data. Learn about Kepler's Laws, practice orbital maneuvers, and engage in mission objectives. Ideal for students and space enthusiasts.

**Highlights:** Interactive orbital simulations, Kepler's Laws visualization, Orbital maneuver practice, Real-time solar system view, Customizable orbital parameters, Detailed educational content, Mission-based challenges

**Features:** macOS Compatibility

**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 Orbital Simulator free?

Orbital Simulator is free to download, with no in-app purchases.

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

Orbital Simulator is rated higher. Stars Units Sizes Objects averages 4.2 out of 5 from 5 ratings, while Orbital Simulator averages 5.0 from 5 ratings.

### Do Stars Units Sizes Objects or Orbital Simulator have ads?

Both Stars Units Sizes Objects and Orbital Simulator show ads.

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

Stars Units Sizes Objects ships an update every 4 months, and Orbital Simulator fortnightly. Most recently, Stars Units Sizes Objects was updated on September 7, 2026 and Orbital Simulator on July 8, 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.*