The Fourth Dimension1.14

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

Over 250,000 people have blown their minds with this app.

Version History Updated for iOS 17.
Plays audio when the device's Silent Mode is on. 1.14 10/17/2023 Updated for iOS 16. 1.13 09/12/2022 Updated for iOS 15. 1.12.1 10/16/2021 Updated for iOS 15. 1.12 10/03/2021 Updated for iOS 13. 1.11 09/26/2019 Bug fixes. 1.10 09/11/2019 Added privacy policy.
Updated for iOS 12. 1.9 10/01/2018 Updated for iPhone X.
Bug fixes. 1.8.2 11/28/2017 Bug fixes. 1.8.1 09/27/2017 Updated for iOS 11. 1.8 09/26/2017 Bug fixes. 1.7.1 06/07/2017 Bug fixes. 1.7 01/11/2017 Updated for iOS 10.
Updated for 12.9 inch iPad Pro.
Improved Chinese localization.
Bug fixes. 1.6 09/20/2016 Updated for iOS 10.
Updated for iPad Pro.
Improved Chinese localization.
Bug fixes. 1.5 09/14/2016 Added language selection option. 1.4 09/01/2015 Updated for iOS 9.
Improved French localization.
Localized for Russian. 1.3 08/28/2015 Localized for French, Italian, German, Spanish, Japanese, Korean, and Chinese. 1.2.1 01/30/2015 Localized for French, Italian, German, Spanish, Japanese, Korean, and Chinese. 1.2 12/31/2014 • Bug fixes
• Support for iPhone 6 and iPhone 6 Plus
• Updated design for iOS 8 1.1.2 11/05/2014 • Bug fix: Page navigation should now work correctly on iPhone 6 Plus. 1.1.1 10/29/2014 • Support for iPhone 6 and iPhone 6 Plus
• Updated design for iOS 8 1.1 10/25/2014 Bug fixes for iOS 8. 1.0.4 09/18/2014 Fixed shameful startup crash on iOS 7 and added support for 4 inch iPhone models and their extensive vertical girth. 1.0.3 09/24/2013 Support for 3rd generation iPad retina display 1.0.2 04/26/2012 Initial release. 1.0.1 03/19/2012