# Stars Units Sizes Objects vs Solar System&Celestial Objects

The clearest difference is update cadence: Solar System&Celestial Objects at every 6 weeks against Stars Units Sizes Objects's every 4 months. On price, ads, 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.

Stars Units Sizes Objects ships an update every 4 months, Solar System&Celestial Objects every 6 weeks. The most recent releases landed on September 7, 2026 and May 16, 2026 respectively.

## The numbers

| Metric | Stars Units Sizes Objects | Solar System&Celestial Objects |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (5 ratings)](https://appshunter.io/ios/app/stars-units-sizes-objects/id1576148571/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 4 months | **Every 6 weeks** |
| Monetization | Ad-supported | — |
| Size | 124 MB | 62 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) | [NIKI TECH](https://appshunter.io/developer/1788609104) |

## 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


### Solar System&Celestial Objects

[App page](https://appshunter.io/ios/app/solar-system-and-celestial-objects/id6503188651)

**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 Solar System&Celestial Objects free?

Solar System&Celestial Objects is free to download, with no in-app purchases.

### Do Stars Units Sizes Objects or Solar System&Celestial Objects have ads?

Both Stars Units Sizes Objects and Solar System&Celestial Objects show ads.

### Which is updated more often, Stars Units Sizes Objects or Solar System&Celestial Objects?

Stars Units Sizes Objects ships an update every 4 months, and Solar System&Celestial Objects every 6 weeks. Most recently, Stars Units Sizes Objects was updated on September 7, 2026 and Solar System&Celestial Objects on May 16, 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.*