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Fool a Neural Network
Add a small, carefully chosen amount of noise to a digit and watch a neural network change its mind: adversarial examples, running live in your browser. Get details
When a 99% Accurate Test Is Usually Wrong
An interactive look at base rates and Bayes’ rule: test 10,000 people at once and watch why a positive result on an accurate test can still usually be a false alarm. Get details
Why Bond Prices Fall When Rates Rise
An interactive look at why a bond’s price drops when interest rates go up. Get details
The Visible Computer
A complete 8-bit computer in your browser: write assembly, then watch every value move between registers, memory, and the ALU while your program draws to a tiny screen. Get details
Evolving Creatures
Soft-body creatures race to the right, the farthest travelers breed, and within a few minutes wobbling blobs learn to run. Get details
Diff Checker
Compare two texts, files, or PDFs privately in your browser. Nothing is uploaded. Get details
Diversification, low fees, and time equals free money
An interactive look at how holding many investments narrows the range of outcomes, cutting the worst cases while keeping most of the upside, and how fees skim off the top. Get details
Epidemic
A stochastic SIR outbreak on a grid: poke it, tune it, vaccinate it, and watch the curve. Get details
Fourier Drawing Machine
Draw any shape and a chain of rotating circles traces it back. Get details
Four in a Row
Play the classic four-in-a-row game against a neural network refined by self-play, and watch it think: the search tree grows in real time as it considers lines. Get details
Fun
A small, growing collection of interactive things, built as an ongoing exercise in seeing what Claude can do. Get details
Gravity Sandbox
A full-screen 2D n-body gravity playground: pick a mass, click to drop a body, or drag it to fling it into orbit, and watch everything pull on everything else. Get details
Hash Avalanche
Watch SHA-256’s avalanche effect: change one character, flip half the bits. Get details
Resize an Image to an Exact File Size in Your Browser
Resize an image to a target file size, crop it, rotate it, strip metadata, and generate a favicon pack, all running privately in your browser with nothing uploaded. Get details
Rocket Lander
A reinforcement-learning agent lands a rocket. Change gravity, wind, or the pad and watch it cope. Get details
Conway's Game of Life
An interactive, full-screen Conway’s Game of Life. Get details
Where Your Loan Payments Actually Go
An interactive look at how loan payments split between interest and principal, and how paying extra toward a loan (especially early) saves you real money over time. Get details
Magnetic Field Visualizer
A full-screen sandbox: drop bar magnets, watch their field lines, and let them snap and repel. Get details
PDF Toolbench: merge, redact, sign, OCR & compress PDFs in your browser
Merge, split, reorder, redact, sign, fill, OCR, watermark, compress, and password-protect PDFs privately, in your browser. Get details
Double Pendulum
Chaos you can grab: two pendulums start 0.001 radians apart and end up nowhere near each other. Get details
QR Studio
Generate and scan QR codes in your browser. The codes are static, so the data lives in the pattern itself, with no redirect service, and a printed code keeps working forever. Get details
Recovering a Secret From Timing Alone
A timing-attack demo: recover a hidden token one character at a time, using nothing but how long a comparison takes. Get details
Tiny Transformer
A tiny GPT writes Shakespeare one character at a time in your browser, with every probability and attention head on display. Get details
Mission to Anywhere
Pick any planet or any real star in the sky, and see what the trip honestly takes, including what relativity does to the clocks. Get details