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  • Price: $2.99 In Apple Store
  • Category: Education
  • Updated: 2011-01-10
  • Current Version: 1.3
  • 1.3
  • Size: 6.80 MB
  • Language: English
  • Seller: Oriol Ferrer Mesia
  • Requirements: Compatible with iPhone, iPod touch, and iPad. Requires iOS 3.0 or later
  • © Oriol Ferrer Mesia 2010
  •  Add to Favorite apps



G is a Gravitation simulator designed for iPad / iPhone.G allows you to quickly experiment the effects of the Universal Gravitation by adding bodies into the simulation, seeing how they react to each other in real time. G offers a vast universe to….. Read more

What's New in Version 1.3

-Improved preview path calculation and visualization.
-Bodies can now be assigned a new speed at any time.
-Retina Display graphics.
-Small bug fixes.

View iPhone screenshots | View iPad screenshots

iPhone Screenshots

G iPhone Screenshot 1
G iPhone Screenshot 2
G iPhone Screenshot 3
G iPhone Screenshot 4
G iPhone Screenshot 5

iPad Screenshots

G iPad Screenshot 1
G iPad Screenshot 2
G iPad Screenshot 3
G iPad Screenshot 4
G iPad Screenshot 5

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Customer reviews

Rated 4/5 based on 3 customer reviews.


4/5 stars
Good, but needs ability to be precise.

This game provided me with countless hours of entertainment, and still is. However, there are 4 edits that I feel this app needs in order to deserve 5 stars.

1: there should be a way to select an exact mass for a body, preferably by typing it in.
2: there should be a way to select a precise velocity for a body, preferably by typing it in.
3: There should be options for simulation speeds of 5, 10, 50, 100, and 500. There are times I want the simulation to run slower than 1000 but I certainly don'y want it to run at a measly 1x speed!
4: there should be a way to shift a body's position without changing its velocity. This way, if an object such as a star begins to shift and I don't want it to, I can fix the problem.
Other things i recommend are the option to zoom in more and shift the grid background to a new location.

4/5 stars
Good, but....

Good but could be better, an option to create a preset planet a proper star, asteroid belt, etc. Would be nice if an option to plot an entire orbit was added and most hopefully a possibility of a black hole addition were to be added.

4/5 stars
Camera Issues

While "G" is an amazing app, there needs to be some fixes with the camera. It is very easy to quickly get into the middle of nowhere, with no idea how to get back. There are a few ways to fix this issue, preferably all of them bieng implemented.
1. An arrow pointing towards the center of the graph (this would be able to be turned on and off)
2. A "camera reset" button that would set the camera in the middle of the graph and at standard zoom
3. When you enter a new simulation, have the camera automatically set in the center and at standard zoom

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