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Fool a Neural Network
Add invisible noise to a digit and watch a neural network change its mind — adversarial examples, 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
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
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 — set a mass, click to drop it, drag to fling it into orbit. 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, rotate, strip metadata, and generate a favicon pack — all privately in your browser. 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 (especially early) saves you money. Get details
Magnetic Field Visualizer
A full-screen sandbox: drop bar magnets, watch their field lines, and let them snap and repel. Get details
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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