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The Fourth Dimension

By Drew Olbrich

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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

“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

“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

What's New in Version 1.2.1

Localized for French, Italian, German, Spanish, Japanese, Korean, and Chinese.


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Customer Reviews

Rated for what it is

Im rating this 5 stars because it does what it says it does, and it does it exceptionally well. Just make sure you understand what youre looking at here. It is an interactive book over 1 (arguably minor) topic, the 4th dimension, and the devs have done an outstanding job with this. I am someone who was introduced to the idea of a 4th dimension years before seeing this book. The ideas in it were not new to me, but the interactivity was. However, I think you'll find that it is mostly a novelty. I cannot comment on if it makes the idea easier to grasp or not, but I can say I came out of this with nothing new. If you have already been introduced to the 4th dimension, this book probably has little to offer you. Its not anything crazy advanced, its exactly what youd expect. I was hoping for something more; Im not sure what, but I thought a book on the subject might have it. Alas, it does not, but it is likely that there simply is no more to talk about. Regardless, the app looks great, and anyone who wants to fully understand the basic concept of 4d will be able to acquire that knowledge here

Excellent Interactivity!

This is a great introduction to the concept of 4D Space. It's only as complicated as it needs to be to elucidate the topic. The interactive segments are fun and interesting. I'd never seen a tesseract with one of the comprising cubes being colored while the others are left transparent; it makes for a more useful visual guide than the standard transparent model. Also, I like the ability to manipulate the models in 4D as well as 3D space, and to toggle between the two.

This is an excellent app that I think would be fun for many people, young and old, even if they aren't particularly interested in the mathematics behind the ideas. I only wish it was longer. Highly recommended!


I've been reading about the fourth dimension for decades, but never understood or pictured it as well as I do now thanks to this ingenious app. It really deserves to be better known and more widely appreciated. It makes brilliant use of both the iPad's ability to show animation and its multi-touch interface.

I hope the developer will consider extending the app to cover other 4D shapes. He's also made himself the obvious person to create an interactive version of Abbot's classic, FLATLAND.

In the meantime, get this app, and break through to walls of mere 3D perception. If this topic interests you at all, you won't regret it.

The Fourth Dimension
View In iTunes
This app is designed for both iPhone and iPad
  • $2.99
  • Category: Books
  • Updated:
  • Version: 1.2.1
  • Size: 5.7 MB
  • Languages: English, French, German, Italian, Japanese, Korean, Simplified Chinese, Spanish, Traditional Chinese
  • Seller:

Compatibility: Requires iOS 7.0 or later. Compatible with iPhone, iPad, and iPod touch. This app is optimized for iPhone 5, iPhone 6, and iPhone 6 Plus.

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