# PlanetenSpielundApp2b vs Stars Units Sizes Objects

The clearest difference is rating: Stars Units Sizes Objects at 4.3 against PlanetenSpielundApp2b's 3.5. Stars Units Sizes Objects also leads on ratings volume (6 vs 2) and iOS requirement (11.0 vs 18.0). PlanetenSpielundApp2b's advantage is ads (none vs shown) and monetization model (free vs ad-supported). On price, update cadence, 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 holds the better App Store score, 4.3 against 3.5. Both are backed by a comparable volume of ratings — 2 and 6 respectively.

PlanetenSpielundApp2b ships an update every 7 months, Stars Units Sizes Objects every 4 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | PlanetenSpielundApp2b | Stars Units Sizes Objects |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.5 (2 ratings)](https://appshunter.io/ios/app/planetenspielundapp2b/id1494749871/reviews) | **[4.3 (6 ratings)](https://appshunter.io/ios/app/stars-units-sizes-objects/id1576148571/reviews)** |
| Number of ratings | 2 | **6** |
| Positive reviews | — | 80.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 7 months | **Every 4 months** |
| Monetization | **Free** | Ad-supported |
| Size | 152 MB | 124 MB |
| Requires iOS | 18.0 | **11.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Steffen Rokosch](https://appshunter.io/developer/1448755222) | [Mudarmeen Munlin](https://appshunter.io/developer/1348165664) |

## What reviewers say

### PlanetenSpielundApp2b

[App page](https://appshunter.io/ios/app/planetenspielundapp2b/id1494749871)

An educational game designed for children to explore and learn about celestial bodies, including planets, moons, stars, and black holes. It features a gravitation arena to demonstrate Newton's laws of motion.

**Highlights:** Learn about planets, moons, and stars, Explore black holes and nebulae, Gravitation arena for physics demonstrations, Interactive celestial body learning, Newton's laws of motion explained

**Features:** macOS Compatibility

**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, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is PlanetenSpielundApp2b free?

PlanetenSpielundApp2b 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, PlanetenSpielundApp2b or Stars Units Sizes Objects?

Stars Units Sizes Objects is rated higher. PlanetenSpielundApp2b averages 3.5 out of 5 from 2 ratings, while Stars Units Sizes Objects averages 4.3 from 6 ratings.

### Do PlanetenSpielundApp2b or Stars Units Sizes Objects have ads?

Stars Units Sizes Objects shows ads; PlanetenSpielundApp2b does not.

### Which is updated more often, PlanetenSpielundApp2b or Stars Units Sizes Objects?

PlanetenSpielundApp2b ships an update every 7 months, and Stars Units Sizes Objects every 4 months. Most recently, PlanetenSpielundApp2b 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.*