Rapier

Physics engineOpen source· verified Sep 2026

A 2D and 3D physics engine written in Rust and shipped to JavaScript as WebAssembly. Deterministic simulation, rigid bodies, joints, and character controllers.

Official site

Reach for it when

Adding real physics to Three.js or R3F scenes
Deterministic simulation for multiplayer

In stack playbooks

3D web game: Three.js + Rapier + Vite

Physics compiled to WebAssembly

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