# Gravity! vs Planet Fun

The clearest difference is rating: Planet Fun at 4.8 against Gravity!'s 3.9. Planet Fun also leads on in-app purchases (none vs 1) and update cadence (every 4 weeks vs every 2 months). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. Gravity! sells 1 one-off in-app purchase. Planet Fun asks for nothing beyond the download.

Planet Fun holds the better App Store score, 4.8 against 3.9. Both are backed by a comparable volume of ratings — 18 and 8 respectively.

Gravity! ships an update every 2 months, Planet Fun every 4 weeks. The most recent releases landed on August 6, 2026 and June 4, 2026 respectively.

## The numbers

| Metric | Gravity! | Planet Fun |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.9 (18 ratings)](https://appshunter.io/ios/app/gravity/id738871919/reviews) | **[4.8 (8 ratings)](https://appshunter.io/ios/app/planet-fun/id1525941640/reviews)** |
| Number of ratings | **18** | 8 |
| Positive reviews | 73.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 17 MB | 161 MB |
| Requires iOS | 15.6 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Marc Davis](https://appshunter.io/developer/1010892850) | [Omar reis](https://appshunter.io/developer/687921629) |

## What reviewers say

### Gravity!

[App page](https://appshunter.io/ios/app/gravity/id738871919)

Simulate the forces of gravity by flinging particles and observing their interactions. Create celestial bodies like planets and black holes, and customize their properties. Explore vast cosmic simulations with intuitive zoom and pan controls.

**Highlights:** Gravity simulation, Particle interaction, Create solar systems, Add black holes, Adjust particle properties, Zoom and pan controls

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gravity! Extended Edition | $0.99 | one-time |


### 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


## Frequently asked questions

### Is Gravity! free?

Gravity! is free to download, with in-app purchases available.

### Is Planet Fun free?

Planet Fun is free to download, with no in-app purchases.

### Which has better reviews, Gravity! or Planet Fun?

Planet Fun is rated higher. Gravity! averages 3.9 out of 5 from 18 ratings, while Planet Fun averages 4.8 from 8 ratings.

### Do Gravity! or Planet Fun have ads?

Neither Gravity! nor Planet Fun shows ads.

### Which is updated more often, Gravity! or Planet Fun?

Gravity! ships an update every 2 months, and Planet Fun every 4 weeks. Most recently, Gravity! was updated on August 6, 2026 and Planet Fun on June 4, 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.*