# Pocket Planets vs Stars Units Sizes Objects

The clearest difference is rating: Pocket Planets at 4.6 against Stars Units Sizes Objects's 4.2. Pocket Planets also leads on update cadence (every 3 weeks vs every 4 months) and ratings volume (22 vs 5). Stars Units Sizes Objects's advantage is review sentiment (80% vs 67%). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Pocket Planets holds the better App Store score, 4.6 against 4.2. Both are backed by a comparable volume of ratings — 22 and 5 respectively. Written reviews complicate that: 67% of Pocket Planets's written reviews are positive against 80% of Stars Units Sizes Objects's, so the app with the better star average is not the one people write more warmly about.

Pocket Planets ships an update every 3 weeks, Stars Units Sizes Objects every 4 months. The most recent releases landed on September 8, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | Pocket Planets | Stars Units Sizes Objects |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (22 ratings)](https://appshunter.io/ios/app/pocket-planets/id1496547610/reviews)** | [4.2 (5 ratings)](https://appshunter.io/ios/app/stars-units-sizes-objects/id1576148571/reviews) |
| Number of ratings | **22** | 5 |
| Positive reviews | 66.7% of reviews | **80.0% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | **Every 3 weeks** | Every 4 months |
| Monetization | Ad-supported | Ad-supported |
| Size | 66 MB | 124 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ad Lunam Kereskedelmi es Szolgaltato Korlatolt Felelossegu Tarsasag](https://appshunter.io/developer/1496547609) | [Mudarmeen Munlin](https://appshunter.io/developer/1348165664) |

## What reviewers say

### Pocket Planets

[App page](https://appshunter.io/ios/app/pocket-planets/id1496547610)

Explore our solar system with detailed information on planets, moons, and astronauts. Track who is currently in space and receive notifications for new launches. Access NASA images and compare celestial body characteristics.

**Highlights:** Detailed planet and moon data, Astronaut information and missions, Real-time space occupancy, Launch notifications, NASA image gallery, Celestial body comparisons

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

**In-app purchases:** none


### 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 Pocket Planets free?

Pocket Planets is free to download, with no 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, Pocket Planets or Stars Units Sizes Objects?

Pocket Planets is rated higher. Pocket Planets averages 4.6 out of 5 from 22 ratings, while Stars Units Sizes Objects averages 4.2 from 5 ratings.

### Do Pocket Planets or Stars Units Sizes Objects have ads?

Both Pocket Planets and Stars Units Sizes Objects show ads.

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

Pocket Planets ships an update every 3 weeks, and Stars Units Sizes Objects every 4 months. Most recently, Pocket Planets was updated on September 8, 2026 and Stars Units Sizes Objects on September 7, 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.*