# Rapier
URL: https://wwadd.dev/tools/rapier · Official site: https://rapier.rs
Kind: Physics engine · License: Open source · Last verified: 2026-09-28

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

Reach for it when:
- Adding real physics to Three.js or R3F scenes
- Deterministic simulation for multiplayer

Repository: https://github.com/dimforge/rapier
Recorded SPDX baseline: Apache-2.0