Free
In-App Purchases

Details

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Features

Gravity! video #1 for iPhone
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About

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.

Gravity simulation
Particle interaction
Create solar systems
Add black holes
Adjust particle properties
Zoom and pan controls
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What's New in Gravity!

2.1.3

June 16, 2026

This version (2.1.3) includes a fix for In-App Purchase issues with the previous version, as well as some minor UI improvements. The previous version (2.1.2) introduced: Experimental new feature for paid users: Orbit Assist By turning on Orbit Assist, added planets will be sent in a trajectory computed to produce a good orbit rather than just the direction you swipe. There are 3 different orbit assist strategies, and the best choice will depend on the situation. Experiment and see what works!

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In-App Purchases

$0.99

Gravity! Extended Edition

Unlocks additional tools and features.

User reviews

Love the Apple Watch implementation

I love the… animation of a slightly eccentric orbit going round and round for all of eternity. Not to mention that the center object doesn’t move a pixel which is unrealistic! 10/10 Apple Watch support, so much fun watching the animation and… yeah!

Fun.

Very fun

Add an update

So I can’t even make things orbit each other so boring

One of the best apps I used to understand the gravity

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Can't make a star

How do I make a star put how to make a star in the tutorial

Developer apps

FAQ

What does the Gravity! app do?

This app simulates the effects of gravity, allowing users to fling particles and observe their interactions. You can create celestial bodies like planets, asteroids, and black holes, and customize their properties such as size, mass, and color.

What are the key features of Gravity!?

Key features include simulating gravity, particle interactions, creating solar systems and galaxies, adding black holes, adjusting particle properties (size, mass, color), and intuitive two-finger zoom and pan controls for exploration.

Is Gravity! free to use?

The app is free to download and use, but it offers in-app purchases. This means you can enjoy the core simulation features for free, with optional purchases available for additional content or features.

What can I create with Gravity!?

You can create a variety of cosmic scenarios. This includes making planets and flinging asteroids at them, forming entire solar systems and galaxies, and even introducing black holes to observe their gravitational pull on surrounding objects.

What kind of devices is Gravity! compatible with?

While specific compatibility details are not provided in the description, this app is designed for mobile devices. Users can typically expect it to run on smartphones and tablets that support its operating system.