Fun
Some fun, sometimes interactive, things. Most of this was built as an ongoing exercise in seeing what Claude can do: I supply ideas, direction, and review, and Claude writes most of the code.
Machine learning & AI
Fool a Neural Network
Add a sliver of carefully aimed noise to a digit and watch a neural network change its answer, while the image looks unchanged.
Rocket Lander
A reinforcement-learning agent lands a rocket. Change gravity, wind, or the pad and watch it cope.
Tiny Transformer
A tiny language model writes Shakespeare one character at a time, with its attention heads on display.
Computing & simulations
Conway's Game of Life
A full-screen cellular automaton you can draw on. Change the rules or drop in classic patterns.
Epidemic
Every cell is a person. Start an outbreak, tune how it spreads, then vaccinate and watch herd immunity.
Hashes & Collisions
Watch SHA-256's avalanche effect, then find a real CRC32 collision in a fraction of a second.
Fourier Drawing Machine
Draw any shape and a chain of rotating circles traces it back.
Timing Attack
Recover a hidden token character by character, using nothing but how long each guess takes to reject.
Base Rates
Test 10,000 people at once and see why a positive result on an accurate test is usually a false alarm.
Physics
Gravity Sandbox
Fling masses into orbit and watch Newtonian gravity pull them together, merge, and trace long paths.
Magnetic Field
Drop bar magnets and watch their field lines weave; opposite poles snap together, like poles repel.
Double Pendulum
Two pendulums start a hair apart and end up with nothing in common. Chaos, on screen.
Money
Bonds & Interest Rates
Why a bond's price falls when rates rise. Drag the rate and watch today's price move.
Where Loan Payments Go
How each payment splits between interest and principal, and why paying extra early saves a lot.
Diversification & Risk
Why holding many investments narrows outcomes while keeping the upside, and how fees skim the top.
Handy tools
Image Studio
Resize an image to a target file size, crop, rotate, strip EXIF, or make a favicon pack. All in your browser.
PDF Toolbench
Merge, split, reorder, rotate, redact, sign, and fill PDFs. Private and in-browser; nothing is uploaded.
QR Studio
Generate and scan static QR codes that never expire. In your browser; nothing is uploaded.
Diff Checker
Compare two texts, files, or PDFs and see exactly what changed. In your browser; nothing is uploaded.