Drag your mouse or finger to stir up colorful, swirling ink and smoke — a real fluid dynamics simulation running live, right here.
🔒 Runs entirely in your browser — nothing is recorded or sent anywhere.
Every frame solves velocity diffusion, pressure projection and advection on a grid — genuine Navier-Stokes fluid dynamics, not a pre-rendered animation.
Each stroke's hue is advected and diffused exactly like the ink density itself, so colors blend and swirl the way real dyes do.
No goals, no score — just a satisfying, endlessly different visual to fidget with during a break.
Yes — it runs Jos Stam's classic "stable fluids" Navier-Stokes solver (diffusion, pressure projection and advection) on a grid every frame, the same technique behind most real-time smoke and ink effects.
Each new stroke picks a fresh random hue, carried along by the same simulation as the ink itself — so colors swirl and blend together exactly like the fluid they represent.
No — it only reads mouse or touch position on this page. Nothing is recorded, uploaded or stored.