Comparison

The Fourth Dimension vs Neural Network

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Interactive 3D touch interface
  • Explains the fourth dimension
  • Accessible language for all
  • 30-page interactive book
  • Visual and hands-on learning
Read full description

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.

About

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.

Highlights
  • Interactive tutorials with charts
  • Visualized neural network lab
  • Gamified learning missions
  • Variety of 2D/3D datasets
  • Visualized deep learning models
  • Intuitive model editor
Features
Read full description

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

The Fourth Dimension4 screens
Neural Network4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level
The Fourth Dimension versus Neural Network: the parameters behind the verdict, then further details
ParameterThe Fourth DimensionNeural Network
Price$2.99Free — better
Rating4.8 (1.9K ratings) — better4.7 (141 ratings)
Positive reviews94.2% of reviews — better85.1% of reviews
Number of ratings1.9K — better141
Update frequencyEvery 4 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS15.0 — better15.6
Further details — not scored
Size5 MB60 MB
Age rating4+4+
DeveloperLunar Skydiving LLC大胜 纪

Customer experience

The Fourth Dimension

All ratings1,947 ratings
Positive97.0%
Neutral1.4%
Negative1.6%
Written reviews312 reviews
Positive94.2%
Neutral1.9%
Negative3.8%

Neural Network

All ratings141 ratings
Positive92.2%
Neutral3.5%
Negative4.3%
Written reviews47 reviews
Positive85.1%
Neutral6.4%
Negative8.5%

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
Show 3 more
  • 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
Show 10 more
  • 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

None

The Fourth Dimension

No in-app purchases

3 purchases

Neural Network

Subscriptions2
  • Semiannual subscription$12.996 Months
  • Annual subscription$17.991 Year
One-time1
  • Lifetime VIP$24.99

Questions

Is The Fourth Dimension free?
The Fourth Dimension costs $2.99, with no in-app purchases.
Is Neural Network free?
Neural Network is free to download, with in-app purchases available.
Which has better reviews, The Fourth Dimension or Neural Network?
The Fourth Dimension is rated higher. The Fourth Dimension averages 4.8 out of 5 from 1.9K ratings, while Neural Network averages 4.7 from 141 ratings.
Do The Fourth Dimension or Neural Network have ads?
Neither The Fourth Dimension nor Neural Network shows ads.
Which is updated more often, The Fourth Dimension or Neural Network?
The Fourth Dimension ships an update every 4 months, and Neural Network every 3 weeks. Most recently, The Fourth Dimension was updated on November 6, 2026 and Neural Network on November 7, 2026.

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