iPad Screenshots


** Now with 3D display of warped space **

Gravity Lab is a gravity simulator for iPad. It allows you to create dozens of particles with different masses and different initial velocities by simply tapping the screen or drawing a velocity vector. The positions and velocities of all the particles are recalculated in real time. According to Newton's law of universal gravitation, every massive body in the universe influences every other massive body, and it works exactly the same in Gravity Lab. You can toggle a switch to show the acceleration vectors of the bodies, which are proportional to the forces between the bodies and inversely proportional to their masses.

Gravity Lab is a great tool to explore the laws of nature that govern everything in the universe. By being gravitationally attracted to a rock weighing more than 13,000,000,000,000,000,000,000,000 lbs (or almost 6,000,000,000,000,000,000,000 metric tons), we are not very good at intuitively understanding the universal effects of the gravitational forces. For us, standing here on Earth, gravitational forces always point down. Should you, however, spend a day as a heavenly body, your perception would be completely changed.

Gravity lab is a perfect aid for anyone seeking a deeper understanding of physics, or just willing to play around with their own simulated universe.

Gravity Lab includes a short 4-page guide explaining the Newton's law of universal gravitation, the first two of the three Kepler's laws of planetary motion and the concept of gravity assist in spaceflight. All these concepts can be demonstrated using Gravity Lab.

What you can do:
- create your own solar system
- demonstrate complex interaction patterns of multiple massive bodies
- collide massive bodies and demonstrate the conservation of momentum
- display vectors of acceleration due to gravitational forces and observe the acceleration of orbiting bodies
- observe first two of the three Kepler's laws of planetary motion
- demonstrate gravitational slingshot (gravity assist) for increasing the spacecraft's velocity
- observe effects of changing gravitational constant on the gravitational field using "Gravity well" mesh type

How to use
- create bodies by selecting the desired mass and drawing a vector of initial velocity using your finger
- tap to create a stationary body
- pinch to zoom
- use two fingers to pan
- toggle Acceleration on/off to display direction and relative size of body's acceleration (same as the direction of the forces)
- reset particles and zoom level

What’s New

Version 1.3

- 64bit support
- bug fixes

Ratings and Reviews

3.8 out of 5
6 Ratings

6 Ratings


Fun and challenging

Great update! Retina support rocks. Any chance to make this app universal? Would work well on iPhone 6 and 6plus now with the larger screens.

I like trying to create my own system. Two things I would change/add. First, the universe in this app is too small. Some of the orbits I create fall out. It's hard to create an earth moon system when you keep hitting the Roche limit. Second, it would be cool if you could simulate a cloud by putting all 50 pieces on the board at once. It would be a good way to watch a system form.


Uptade needed plz

Plz add the ability to have the mass be able to get bigger. Also plz add black holes and neutron stars! Also plz make it so you can change between planets,stars,blackholes, and neutron holes. Also make a size changer like the mass changer.

CowDaddy ,

Fun to play around with

I don't know the math, but it looks like a realistic simulator to me.


Fjord42 d.o.o.
5.1 MB

Requires iOS 8.0 or later. Compatible with iPad.



Age Rating
Rated 4+
© 2017 Urban Sedlar


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    With Family Sharing set up, up to six family members can use this app.

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