# Stars Units Sizes Objects vs Mega Constellations

The clearest difference is rating: Mega Constellations at 5.0 against Stars Units Sizes Objects's 4.2. Mega Constellations also leads on ads (none vs shown) and update cadence (every 5 days vs every 4 months). Stars Units Sizes Objects's advantage is in-app purchases (none vs 1) and ratings volume (5 vs 1). On price and device support there is nothing between them.

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

Mega Constellations holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Stars Units Sizes Objects has 5 ratings behind it against 1, so its average is the more settled of the two.

Stars Units Sizes Objects ships an update every 4 months, Mega Constellations every 5 days. The most recent releases landed on September 22, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Stars Units Sizes Objects | Mega Constellations |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (5 ratings)](https://appshunter.io/ios/app/stars-units-sizes-objects/id1576148571/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/mega-constellations/id1598820453/reviews)** |
| Number of ratings | **5** | 1 |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 5 days** |
| Monetization | Ad-supported | **Free** |
| Size | 124 MB | 16 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Mudarmeen Munlin](https://appshunter.io/developer/1348165664) | [Hanno Rein](https://appshunter.io/developer/325840976) |

## 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


### Mega Constellations

[App page](https://appshunter.io/ios/app/mega-constellations/id1598820453)

Explore the visual impact of large satellite networks on the night sky. This simulator shows how current and planned mega-constellations affect stargazing based on your location, time, and date.

**Highlights:** Simulates mega-constellation orbits, Visualizes impact on stargazing, Adjustable location, time, and date, Explores effects on astronomy, Shows current and planned constellations

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Developer Appreciation Coffee | $1.99 | one-time |


## Frequently asked questions

### Is Stars Units Sizes Objects free?

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

### Is Mega Constellations free?

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

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

Mega Constellations is rated higher. Stars Units Sizes Objects averages 4.2 out of 5 from 5 ratings, while Mega Constellations averages 5.0 from 1 ratings.

### Do Stars Units Sizes Objects or Mega Constellations have ads?

Stars Units Sizes Objects shows ads; Mega Constellations does not.

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

Stars Units Sizes Objects ships an update every 4 months, and Mega Constellations every 5 days. Most recently, Stars Units Sizes Objects was updated on September 22, 2026 and Mega Constellations on October 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.*