What's New

Fixed shameful startup crash on iOS 7 and added support for 4 inch iPhone models and their extensive vertical girth.

App Description

This app is a 30-page interactive book that explains a single mathematical idea, the fourth dimension, 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.” — John Herrman, BuzzFeed

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

“This is one of my most favorite iOS apps ever.” — George Musser, senior editor at 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

App Screen Shots

(click to enlarge)

App Changes

September 26, 2013 New version 1.0.3
March 22, 2013 Price Decrease: $2.99 -> FREE!
November 03, 2012 Price Decrease: $2.99 -> $0.99
November 30, -0001 Initial Release