Watch algorithms come alive in 3D
Stop memorising diagrams. Spin a binary tree, slow quick sort down to a single swap, and watch a neural network think — every idea becomes a model you can play with until it clicks.
- 96
- 3D lessons
- 8
- subjects
- 384
- quiz questions
A tree explored level by level: breadth-first search (BFS)
Three steps to really understand a concept
See it in 3D
Every concept is a living 3D model. Drag to rotate it, zoom in, and look at it from any angle.
Step through it
Play, pause, or go one step forward and back. Each step is explained in plain English, with the matching line of code highlighted.
Test yourself
Use your own inputs, read the theory and code, then take a quick quiz to check you really got it.
Everything in a CS degree, one 3D model at a time
Start with the live subjects below. New subjects and topics are added regularly.
Data Structures
How data is organised in memory — arrays, stacks, queues, linked lists, trees, heaps, hash tables and graphs — and why the right structure makes programs fast.
Design & Analysis of Algorithms
Step-by-step recipes for solving problems efficiently: sorting, searching, graphs, greedy algorithms, dynamic programming and backtracking — with their time complexity.
AI & Machine Learning
How machines learn from data and make decisions: regression, neural networks, CNNs, clustering, search and game playing — the building blocks behind modern AI.
Operating Systems
What happens inside your computer when many programs run at once: scheduling, memory and deadlocks.
Database Management Systems
How data is stored, indexed and queried reliably — from B+ trees to SQL joins and transactions.
Computer Networks
How data travels across the internet: layers, handshakes, routing and reliable delivery.
Theory of Computation
What computers can and cannot compute: automata, grammars and Turing machines.
Computer Organization & Architecture
How a CPU really executes instructions: pipelines, caches and number representation.
Great places to start
Stack
A pile of plates you can only touch from the top. Learn push, pop and peek — and why all three are O(1).
Binary Search Tree (BST)
A tree where smaller values go left and bigger values go right — so every search throws away half of the tree. Insert, search, delete and traverse it in 3D.
Merge Sort
Divide and conquer in action. In 3D, every level of recursion literally steps towards you — then the pieces merge back in sorted order.
Dijkstra's Shortest Path
How maps find the cheapest route. Watch distances shrink as Dijkstra's algorithm relaxes edges on a 3D weighted graph.
Neural Network (Forward Pass)
See exactly how a neural network turns inputs into a prediction — neuron by neuron, weight by weight — in a 3D network you can rotate.
Gradient Descent
The algorithm that trains almost every AI model — walking downhill on a loss surface. Roll a ball across real 3D surfaces and tune the learning rate.
Frequently asked questions
Is Graphium3D really free?
Yes. Every lesson, 3D model and quiz is free, with no sign-up and no paywall. The site is supported by a small number of ads.
Do I need to install anything?
No. The 3D models run directly in your web browser on laptops, tablets and phones. Any modern browser (Chrome, Edge, Firefox, Safari) works.
I am a complete beginner. Is this for me?
Yes — that is exactly who it is for. Every topic starts with a real-life analogy, then lets you watch the idea happen step by step in 3D before showing any code.
Which subjects are covered?
All eight core subjects are live: Data Structures, Design & Analysis of Algorithms, AI & Machine Learning, Operating Systems, DBMS, Computer Networks, Theory of Computation and Computer Organization & Architecture — each topic with its own 3D model, and new topics are added regularly.
Can I use it to prepare for exams and interviews?
Yes. Each topic includes pseudocode, Python and C++ code, a complexity table and a quick quiz — the things exams and coding interviews ask about. The practice tests mix all 384 quiz questions into random sets, with a timed mock-test mode.