The Fourth Dimension vs Neural Network
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
The Fourth Dimension
Explore a complex mathematical concept through an interactive 3D experience. This app uses a unique touch interface to help you visualize and understand the fourth dimension in an engaging and accessible way.
- Interactive 3D touch interface
- Explains the fourth dimension
- Accessible language for all
- 30-page interactive book
- Visual and hands-on learning
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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. “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.
Neural Network
Explore neural networks through interactive tutorials and visualized labs. Learn key concepts with gamified missions and build models intuitively. Access a variety of datasets and classic deep learning models on the go.
- Interactive tutorials with charts
- Visualized neural network lab
- Gamified learning missions
- Variety of 2D/3D datasets
- Visualized deep learning models
- Intuitive model editor
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Learning and using neural networks in an intuitive and natural way! Intuitive and interactive tutorials. A large number of charts and interactive components are used to make learning more intuitive. Visualized Neural Network Lab. Open the black box of neural networks with simplified datasets and full visualization, gain more intuition. Learning with mission like gaming. In the missions, you will run into many key concepts in neural networks, complete the challenges and acquire a deep understanding. Put neural network lab in your pocket. Variety of datasets: 2D and 3D datasets both with regression and classification. Get the dataset just with a tapping. Do experiments at anytime anywhere. Good visualized neural network knowledges. Key concepts and dynamics are showed with charts and animations. Activations, regularizations, loss functions, classifications, Embedding, CNN1d, CNN2d, RNN and more to come. Visualized Deep Learning Models. Learn the most classic models in an intuitive way that has never been seen before, and quickly master cutting-edge technology. Through modular diagrams, understand how data changes from input to output and how it changes at each step. There are detailed documents for each module, and even reference papers, source codes and animations. Visual neural network model editor. Quickly build a model by dragging your fingers. What you see is what you get: Through real-time calculation and display of the output of each step, the construction of the model has never been so intuitive and efficient; real-time display of various errors, including parameters/input types and value compatibility, etc., abandoning inefficient debugging. MORE FEATURES COMING!!!
Screenshots
Verdict
The clearest difference is price: Neural Network at Free against The Fourth Dimension's $2.99. Neural Network also leads on update cadence (every 3 weeks vs every 4 months). The Fourth Dimension's advantage is in-app purchases (none vs 3) and ratings volume (1.9K vs 141). On rating, ads, monetization model and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Neural Network is free to download; The Fourth Dimension costs $2.99 up front. Neural Network sells 3 in-app purchases, starting at $12.99 per 6 months. The Fourth Dimension asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.8 for The Fourth Dimension against 4.7 for Neural Network. That said, the two scores are not equally well evidenced: The Fourth Dimension has 1.9K ratings behind it against 141, so its average is the more settled of the two. Written reviews are what separate them: 94% of The Fourth Dimension's written reviews are positive against 85% of Neural Network's.
The Fourth Dimension ships an update every 4 months, Neural Network every 3 weeks. The most recent releases landed on November 6, 2026 and November 7, 2026 respectively.
| Parameter | The Fourth Dimension | Neural Network |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 4.8 (1.9K ratings) — better | 4.7 (141 ratings) |
| Positive reviews | 94.2% of reviews — better | 85.1% of reviews |
| Number of ratings | 1.9K — better | 141 |
| Update frequency | Every 4 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 15.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 5 MB | 60 MB |
| Age rating | 4+ | 4+ |
| Developer | Lunar Skydiving LLC | 大胜 纪 |
Customer experience
The Fourth Dimension
Neural Network
Bugs and requests
The Fourth Dimension
Not enough reviews yet to summarise bugs or requests.
Neural Network
Reported bugs
8 issues- Cannot decrement hidden layer nodes
- Network connection error when becoming a member
- Network abnormal when purchasing
- App crashes after section 1.2 1.3
- XOR neural network graph mistake
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- Tutorial section needs further strengthening
- Neural network output not explained
- Cannot predict after model training
Requested features
15 requests- Update traffic widget for iOS
- Make a Neural Network Launcher
- Add a Dark Mode
- Hope to update new neural networks
- Hope to add highlight marking function
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- Model import file type
- Hope for more tutorials
- Add German Language
- Provide a one-time purchase option
- Hope for ads to lower lifetime cost
- Request customer service and technical support
- Expect more tutorials
- Add specialized teaching videos
- Explain neural network prediction
- Add highlight marking function
In-app purchases
The Fourth Dimension
No in-app purchases
Neural Network
- Semiannual subscription$12.996 Months
- Annual subscription$17.991 Year
- Lifetime VIP$24.99
Questions
Is The Fourth Dimension free?
Is Neural Network free?
Which has better reviews, The Fourth Dimension or Neural Network?
Do The Fourth Dimension or Neural Network have ads?
Which is updated more often, The Fourth Dimension or Neural Network?
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