Every course, one grid
Two courses are free forever. The rest ship with Pro, but you can preview every lesson's first screen.
Free
2Thinking in Functions
Build the intuition that makes calculus feel obvious.
The mental model behind every great equation. From substitution to composition, learn to see functions everywhere.
Logic & Proofs
Stop hand-waving. Start proving.
From truth tables to induction. The toolkit that separates guessing from knowing.
Pro
8Algorithms by Hand
Read code. Trace it. Predict what it does. Repeat.
Sorting, searching, and graph traversal — but you trace them yourself, line by line, on the canvas.
Data Structures from Scratch
Stop treating data structures as black boxes.
Arrays, hash maps, trees, graphs — built up from primitive memory, then benchmarked in your browser.
Neural Networks, by Hand
Train a network before you import one.
Backpropagation, gradient descent, and the math of why a single layer can learn XOR — with a live training visualizer.
Electric Circuits
Touch the circuit. See the current.
Ohm's law to RC filters, with interactive simulators that you can poke at until the intuition clicks.
DNA & Genetics
See the molecule. Watch it work.
From base pairing to central dogma. Visualize transcription and translation as the molecular machinery runs.
Signals & Systems
Hear the math.
Fourier transforms, filters, and the math of audio — built from the ground up with a real-time signal playground.
Graphs & Networks
Map the world. Find the path.
Shortest path, centrality, and the small-world phenomenon. Build, query, and visualize real networks.
Binary & Bits
Everything is bits. Master the bits.
Counting, bitwise ops, and the small set of tricks that make every computer program faster.