Toys, curiosities and tools in your browser - maths and graphics computed on the graphics card. Works instantly, no installation, on phones too.
Fractals 2D
The Mandelbrot set, Julia sets, the Burning Ship. Zoom as deep as 10³⁰ - with colours, relief and image export.
Fractals 3D
Mandelbulb, Mandelbox, the Menger sponge and other shapes with shadows and light, in real time. You can fly around them.
Three bodies
Three stars and gravity: set their positions, masses and speeds, then watch them dance - or one of them escape. Gravity wells shown below.
Game of Life
Conway's cellular automaton on the graphics card - boards up to 4096 × 4096 and a pattern library with notes: still lifes, oscillators, gliders, guns, methuselahs. Plus other rules and RLE.
3D cellular automata
The Game of Life in three dimensions: crystals, corals and clouds grown from simple rules on the GPU, with a studio path-traced render and 4K export.
3D fluids
A FLIP liquid simulation on the GPU: dam break, a drop in a pool, pouring. Water, wine, milk or mercury, with a studio render that refracts light.
L-systems
Plants, snowflakes and curves from simple rewriting rules - 17 examples, your own grammars, random rules, 3D trees, growth animation and SVG export.
Digital logic studio
Gates, flip-flops, counters, memories and an oscilloscope - wire them up and watch the signals. The examples include a working 8-bit CPU with a program in ROM.
Resistor networks
Draw a circuit of resistors and sources and get the equivalent resistance (with the series-parallel formula), node voltages, currents and power.
Electric field
Place positive and negative charges and see the field lines, equipotentials and a potential map. A probe measures the field, and a proton or electron flies through it.
Magnetic field
Current-carrying wires and bar magnets: closed field lines, iron filings, compass needles and the forces between wires. Magnets can be rotated.
Lorentz force
Electrons, protons and ions in E and B fields: circular motion, Wien filter, mass spectrometer, cyclotron, E×B drift and a calutron separating uranium isotopes.
Nuclidea.com - Interesting isotopes
Record holders among nuclides: the longest decay chains, the most decay branches, isomers and parents - with links to Nuclidea.
Nuclidea.com
The periodic table, over 3000 isotopes on the chart of nuclides and a radioactive decay simulator - a separate site, nuclidea.com.
QTH Locator
Maidenhead locator from the map, QRB distance and QTF bearing between two locators - for radio amateurs.