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The Fourth Dimension

By Drew Olbrich

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Over 15,000 paid installs. 5 stars from 500 ratings.

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.

“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

“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

What's New in Version 1.4

Added language selection option.


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Customer Reviews

Absolutely Fascinating!

This app only takes a few minutes to navigate through, but you will most likely enjoy it. If you like science and thinking about abstract concepts, you will love this app and want to share it with all of your friends.

Interesting, but not worth the price

I’ve been interested in the subject ever since reading Heinlein’s “And He Built a Crooked House” almost 40 years ago. I was hoping that for the listed price, the app would have more interactivity, but it is little more than a semi-interactive, animated slideshow. It is well done, but for me, it leaves a bit to be desired.

Great App - should be listed under "essentials"

Helped me get a better grasp of some things. I can't say I fully understand everything taught within the app but every day I "get it" a little more.
Just as a side-note: I got very sleepy during my first time going through the app.

The Fourth Dimension
View In iTunes
This app is designed for both iPhone and iPad
  • $2.99
  • Category: Reference
  • Updated:
  • Version: 1.4
  • Size: 6.2 MB
  • Languages: English, French, German, Italian, Japanese, Korean, Russian, Simplified Chinese, Spanish, Traditional Chinese
  • Seller:

Compatibility: Requires iOS 7.0 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

Current Version:
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