# Gravity! vs PhySim Lab

The clearest difference is price: Gravity! at Free against PhySim Lab's $0.99. Gravity! also leads on ratings volume (18 vs 3) and review sentiment (74% vs 65%). PhySim Lab's advantage is in-app purchases (none vs 1) and update cadence (every 5 days vs every 2 months). On ads and device support there is nothing between them.

Gravity! is free to download; PhySim Lab costs $0.99 up front. Gravity! sells 1 one-off in-app purchase. PhySim Lab asks for nothing beyond the download.

PhySim Lab holds the better App Store score, 4.3 against 3.9. That said, the two scores are not equally well evidenced: Gravity! has 18 ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 74% of Gravity!'s written reviews are positive against 65% of PhySim Lab's, so the app with the better star average is not the one people write more warmly about.

Gravity! ships an update every 2 months, PhySim Lab every 5 days. The most recent releases landed on October 7, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Gravity! | PhySim Lab |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | [3.9 (18 ratings)](https://appshunter.io/ios/app/gravity/id738871919/reviews) | **[4.3 (3 ratings)](https://appshunter.io/ios/app/physim-lab/id1521781822/reviews)** |
| Number of ratings | **18** | 3 |
| Positive reviews | **73.5% of reviews** | 64.5% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 days** |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 17 MB | 49 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Marc Davis](https://appshunter.io/developer/1010892850) | [铖 邢](https://appshunter.io/developer/1497880786) |

## 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 |


### PhySim Lab

[App page](https://appshunter.io/ios/app/physim-lab/id1521781822)

Explore classical mechanics through interactive simulations. Design and test physics experiments, simulate celestial motion, and generate custom textures for objects. Group editing and object tracking enhance the learning experience.

**Highlights:** Classical mechanics simulations, Celestial body motion simulation, Custom texture generation from photos, Group editing of objects, Object following and watching modes, Gravitation and magnetic force simulation

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

**In-app purchases:** none


## Frequently asked questions

### Is Gravity! free?

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

### Is PhySim Lab free?

PhySim Lab costs $0.99, with no in-app purchases.

### Which has better reviews, Gravity! or PhySim Lab?

PhySim Lab is rated higher. Gravity! averages 3.9 out of 5 from 18 ratings, while PhySim Lab averages 4.3 from 3 ratings.

### Do Gravity! or PhySim Lab have ads?

Neither Gravity! nor PhySim Lab shows ads.

### Which is updated more often, Gravity! or PhySim Lab?

Gravity! ships an update every 2 months, and PhySim Lab every 5 days. Most recently, Gravity! was updated on October 7, 2026 and PhySim Lab on October 8, 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.*