# Cosmic Eye vs Stars Units Sizes Objects

The clearest difference is price: Stars Units Sizes Objects at Free against Cosmic Eye's $0.99. Stars Units Sizes Objects also leads on rating (4.2 vs 2.9) and review sentiment (80% vs 38%). Cosmic Eye's advantage is ads (none vs shown) and ratings volume (89 vs 5). On device support and iOS requirement there is nothing between them.

Stars Units Sizes Objects is free to download; Cosmic Eye costs $0.99 up front. Cosmic Eye sells 1 one-off in-app purchase. Stars Units Sizes Objects asks for nothing beyond the download.

Stars Units Sizes Objects holds the better App Store score, 4.2 against 2.9. That said, the two scores are not equally well evidenced: Cosmic Eye has 89 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 38% of Cosmic Eye's written reviews are positive against 80% of Stars Units Sizes Objects's.

Cosmic Eye ships an update every 6 weeks, Stars Units Sizes Objects every 4 months. The most recent releases landed on October 21, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Cosmic Eye | Stars Units Sizes Objects |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [2.9 (89 ratings)](https://appshunter.io/ios/app/cosmic-eye/id519994935/reviews) | **[4.2 (5 ratings)](https://appshunter.io/ios/app/stars-units-sizes-objects/id1576148571/reviews)** |
| Number of ratings | **89** | 5 |
| Positive reviews | 38.2% of reviews | **80.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 6 weeks** | Every 4 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 42 MB | 124 MB |
| Requires iOS | **10.0** | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Danail Obreschkow](https://appshunter.io/developer/448923432) | [Mudarmeen Munlin](https://appshunter.io/developer/1348165664) |

## What reviewers say

### Cosmic Eye

[App page](https://appshunter.io/ios/app/cosmic-eye/id519994935)

Explore the universe from subatomic particles to the observable cosmos with incredible zoom capabilities. View real astronomical and microscopic photographs alongside stunning computer-generated models. This app offers a journey through scales inspired by iconic scientific visualizations.

**Highlights:** Enormous zoom factors, Subatomic to cosmic scales, Real photographs, Computer model renderings, Inspired by 'Powers of Ten'

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cosmic Eye Pro | Free | one-time |

**What reviewers like**

- ✨ Visually captivating experience
- 🌌 Great for understanding scale
- 👍 Easy to use and understand
- 💡 Interesting concept and educational
- 🤩 Amazing and spectacular app

**What reviewers complain about**

- 💸 Requires multiple purchases
- 🤔 Misleading pricing and free versions
- 💰 Feels like a scam for money
- 😠 Frustrating upgrade system
- 👎 Poor implementation and graphics

**Reported bugs**

- Upgrade not working
- In-app purchase not working after payment
- App crashes on load
- Cannot move camera freely
- Low resolution graphics

**Requested features**

- Zoom out of the universe and into the atomic nucleus
- Zoom in to Planck length and out to beyond the universe
- Make it so we can zoom out of the universe and very far into the atomic nucleus
- Make it so we can zoom in all the way to Planck length and all the way out to Beyond the universe
- Make it so we can zoom out of the universe and very far into the atomic nucleus


### 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 Cosmic Eye free?

Cosmic Eye costs $0.99, and also offers in-app purchases.

### Is Stars Units Sizes Objects free?

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

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

Stars Units Sizes Objects is rated higher. Cosmic Eye averages 2.9 out of 5 from 89 ratings, while Stars Units Sizes Objects averages 4.2 from 5 ratings.

### Do Cosmic Eye or Stars Units Sizes Objects have ads?

Stars Units Sizes Objects shows ads; Cosmic Eye does not.

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

Cosmic Eye ships an update every 6 weeks, and Stars Units Sizes Objects every 4 months. Most recently, Cosmic Eye was updated on October 21, 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.*