FoilBrain is a real-time physics simulator for eFoil and hydrofoil riding, built entirely in the browser with Three.js. Three Gerstner ocean swells combine with wind chop to generate authentic open-ocean wave conditions — the same math used in film VFX and marine simulation.

Your goal: find the pocket — the fast-moving face of the wave where gravity-driven slope acceleration keeps your board flying. Pump to build speed, manage your battery, and stay airborne.

Wave height, period, direction, and board physics are all fully adjustable. Terrain is rendered from real elevation and satellite data, starting with Swell City on the Columbia River Gorge. More locations coming soon.