Conway's Game of Life
The famous cellular-automaton sandbox. Draw cells or drop in gliders, guns and oscillators, then watch complex patterns evolve from four simple rules.
Open lab FreeGravity Orbit Simulator
Newtonian gravity you can play with. Load the Sun–Earth–Moon, a binary star or the chaotic three-body problem, then fling in new planets and watch their trails.
Open lab FreeDouble Pendulum
A textbook example of deterministic chaos. Set two pendulums a hair apart and watch identical rules send them onto wildly different paths.
Open lab FreeSimple Harmonic Motion
The smoothest motion in physics. Release a mass on a spring or a simple pendulum and watch it draw its own sine wave, trade energy back and forth, and reveal where "simple" breaks down.
Open lab FreeDouble-Slit Experiment
The famous "only mystery" of quantum mechanics. Fire waves or single photons through two slits and watch interference fringes build up dot by dot — then close a slit and watch them vanish.
Open lab FreeWave on a String
The simplest travelling wave. Send a pulse and watch it reflect — flipping at a fixed end, staying upright at a free one — or drive the end steadily until the string locks into a standing wave.
Open lab FreeFalling Sand
A cellular-automaton powder toy. Paint sand, water, oil, fire and smoke and watch them pile, flow and burn — water douses fire, fire races along oil, sand sinks through water.
Open lab FreeFluid Simulation
Stir a real-time fluid with your mouse. A stable Navier–Stokes solver swirls dye and velocity across the grid — mesmerising, and surprisingly physical.
Open lab FreeLorenz Attractor
The iconic butterfly of chaos theory, in rotatable 3D. A trajectory that never repeats yet stays forever on the same strange surface — nudge the start and watch two twins diverge.
Open lab FreeBifurcation Diagram
Chaos theory's most famous picture. Sweep the logistic map's growth rate and watch one value split — 2, 4, 8 — into the period-doubling cascade, then zoom into the fractal.
Open lab FreeReaction-Diffusion
Turing patterns growing in real time. Two diffusing chemicals react to paint spots, stripes, mazes and coral — the mechanism behind leopard spots and seashells. Paint your own.
Open lab FreeCharged Particle in a Magnetic Field
The Lorentz force made visible. Watch a charge circle in a magnetic field and drift under crossed fields — then switch to the dipole mode where particles spiral to the poles as the aurora.
Open lab