# Saturn vs Stars Units Sizes Objects

The clearest difference is rating: Saturn at 5.0 against Stars Units Sizes Objects's 4.3. Stars Units Sizes Objects's advantage is in-app purchases (none vs 1) and update cadence (every 4 months vs every 10 months). On price, ads and device support there is nothing between them.

Both are free to download. Saturn sells 1 one-off in-app purchase. Stars Units Sizes Objects asks for nothing beyond the download.

Saturn holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: Stars Units Sizes Objects has 6 ratings behind it against 1, so its average is the more settled of the two.

Saturn ships an update every 10 months, Stars Units Sizes Objects every 4 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | Saturn | Stars Units Sizes Objects |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/saturn-cassini/id1567740684/reviews)** | [4.3 (6 ratings)](https://appshunter.io/ios/app/stars-units-sizes-objects/id1576148571/reviews) |
| Number of ratings | 1 | **6** |
| Positive reviews | — | 80.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 10 months | **Every 4 months** |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 74 MB | 124 MB |
| Requires iOS | 17.0 | **11.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 9+ | 4+ |
| Developer | [Alparslan Topbas](https://appshunter.io/developer/1130875171) | [Mudarmeen Munlin](https://appshunter.io/developer/1348165664) |

## What reviewers say

### Saturn

[App page](https://appshunter.io/ios/app/saturn-cassini/id1567740684)

Explore stunning high-definition images and videos of Saturn and its moons. This app offers interactive 3D models and detailed insights into the Cassini mission. Perfect for space enthusiasts and students.

**Highlights:** Browse hundreds of stunning photos with detailed insights, Cinematic slideshow for an immersive orbiting experience, Interactive gallery with high-resolution zoom, Watch historic Cassini-Huygens mission videos, Explore interactive 3D models of the Saturn system, Modern glassmorphism UI with dark mode

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | 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, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Saturn free?

Saturn 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, Saturn or Stars Units Sizes Objects?

Saturn is rated higher. Saturn averages 5.0 out of 5 from 1 ratings, while Stars Units Sizes Objects averages 4.3 from 6 ratings.

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

Both Saturn and Stars Units Sizes Objects show ads.

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

Saturn ships an update every 10 months, and Stars Units Sizes Objects every 4 months. Most recently, Saturn was updated on November 3, 2026 and Stars Units Sizes Objects on November 3, 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.*