# Planet Fun vs Stars Units Sizes Objects

The clearest difference is rating: Planet Fun at 4.8 against Stars Units Sizes Objects's 4.2. Planet Fun also leads on ads (none vs shown) and update cadence (every 4 weeks vs every 4 months). On price, ratings volume, 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.

Planet Fun holds the better App Store score, 4.8 against 4.2. Both are backed by a comparable volume of ratings — 8 and 5 respectively.

Planet Fun ships an update every 4 weeks, Stars Units Sizes Objects every 4 months. The most recent releases landed on September 18, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Planet Fun | Stars Units Sizes Objects |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (8 ratings)](https://appshunter.io/ios/app/planet-fun/id1525941640/reviews)** | [4.2 (5 ratings)](https://appshunter.io/ios/app/stars-units-sizes-objects/id1576148571/reviews) |
| Number of ratings | **8** | 5 |
| Positive reviews | — | 80.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 4 weeks** | Every 4 months |
| Monetization | **Free** | Ad-supported |
| Size | 161 MB | 124 MB |
| Requires iOS | 11.0 | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Omar reis](https://appshunter.io/developer/687921629) | [Mudarmeen Munlin](https://appshunter.io/developer/1348165664) |

## What reviewers say

### Planet Fun

[App page](https://appshunter.io/ios/app/planet-fun/id1525941640)

Explore a 4D solar system simulation with accurate astronomical calculations for planets, moons, and stars. Interact with the celestial bodies using touch gestures, set any date and time, and even view your GPS position in augmented reality.

**Highlights:** 4D solar system simulation, Configurable animation speed, Augmented reality mode, Almanac module with ephemeris calculators, Touch gesture controls, Star and constellation visualization

**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

**In-app purchases:** none


## Frequently asked questions

### Is Planet Fun free?

Planet Fun 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, Planet Fun or Stars Units Sizes Objects?

Planet Fun is rated higher. Planet Fun averages 4.8 out of 5 from 8 ratings, while Stars Units Sizes Objects averages 4.2 from 5 ratings.

### Do Planet Fun or Stars Units Sizes Objects have ads?

Stars Units Sizes Objects shows ads; Planet Fun does not.

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

Planet Fun ships an update every 4 weeks, and Stars Units Sizes Objects every 4 months. Most recently, Planet Fun was updated on September 18, 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.*