What's New

Updated for iOS 9.
Improved French localization.
Localized for Russian.

App Description

“Not only can you blow your own mind over and over again, you can also enjoy watching your friends’ minds being blown in front of you.” — Cult of Mac

The Fourth Dimension is a 30-page interactive book that explains a single mathematical idea in language that anyone can understand. Instead of static images or canned videos, this app employs a unique 3D touch interface that lets you literally grasp the concept of the fourth dimension with your own hands.

“One of the coolest apps I've ever used... The Fourth Dimension is to boring learning apps what Carl Sagan's Cosmos was to staid science documentaries.” — BuzzFeed

“The app is very cool, and it's unlike pretty much anything we've seen in the App Store.” — The Verge

“This is one of my most favorite iOS apps ever.” — George Musser, contributing editor for Scientific American and author of The Complete Idiot's Guide to String Theory

(App Store user reviews follow.)

“Blew my mind. I generally don't use 'learning' apps as they're mostly gimmicks. This one, though, truly made me think. I hope this developer comes out with more outstanding apps such as this one. Bravo!” — Iceitic

“Astounding. That some people care passionately enough about tesseracts to go create a fantastic app for others to understand them is incredible. The app is extremely well designed, wittily written, and executed with love. That alone is worth buying it, besides the fact that I learned what the hell a tesseract was.” — Duncan MacMichael

“Fantastic! This is what someone really smart, and who really knows how to teach well, can do with a tablet. And the authors are funny, too, which is a neat bonus.” — DNY

“Fantastic app. I work at a leading UK university. If only all our material was this well written and presented. Definitely worth buying and then spending a bit of time with over a day or two to get your head around the fourth dimension. Great app!” — JulesFM

“Great job! This app does the best job explaining the 4th dimension. Why learn it in some boring classroom when here you can have an interactive and visual explanation.” — Aco Strklalj

iPhone Screenshots

(click to enlarge)

The Fourth Dimension screenshot 1 The Fourth Dimension screenshot 2 The Fourth Dimension screenshot 3 The Fourth Dimension screenshot 4 The Fourth Dimension screenshot 5

iPad Screenshots

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The Fourth Dimension screenshot 6 The Fourth Dimension screenshot 7 The Fourth Dimension screenshot 8 The Fourth Dimension screenshot 9 The Fourth Dimension screenshot 10

App Changes

  • March 23, 2013 Initial release
  • July 06, 2013 Price decrease: $2.99 -> $1.99
  • July 13, 2013 Price increase: $1.99 -> $2.99
  • October 10, 2013 New version 1.0.3
  • September 21, 2014 New version 1.0.4
  • October 25, 2014 New version 1.1
  • November 03, 2014 New version 1.1.1
  • November 05, 2014 New version 1.1.2
  • December 31, 2014 New version 1.2
  • February 06, 2015 New version 1.2.1
  • February 14, 2015 Price decrease: $2.99 -> $1.99
  • February 15, 2015 Price increase: $1.99 -> $2.99
  • June 22, 2015 Price decrease: $2.99 -> FREE!
  • June 23, 2015 Price increase: FREE! -> $2.99
  • August 21, 2015 Price decrease: $2.99 -> $0.99
  • August 24, 2015 Price increase: $0.99 -> $2.99
  • August 29, 2015 New version 1.3

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