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2D Physics for the Modern Web

Build responsive, real-time physics interactions with a small footprint — perfect for games, education, and interactive UI.

Key Features

Deterministic Solver

Stable, deterministic integration for reproducible simulations across devices.

Modular API

Drop-in components for bodies, joints, collisions and custom constraints — compose what you need.

Tiny Bundle

Optimized for web delivery with tree-shaking-friendly modules and optional renderer integration.

How It Works

Design, Simulate, Ship

Initialize bodies, attach constraints, and run the step loop. The engine exposes clear hooks for state, rendering, and networking so you can sync physics across clients.

  • • Lightweight core for deterministic updates
  • • Plugin hooks for collision filters and event callbacks
  • • Exportable state for save/load and replay
Animated walkthrough / lightweight canvas demo

Live Demos

Interactive Examples

Try demos that showcase collisions, ragdolls, vehicle constraints, and UI physics.

Stack & Collapse

Stack blocks and watch stable collapse behavior.

Open demo
Joint Playground

Explore revolute and distance joints with live controls.

Open demo
UI Physics

Add physics to UI elements for delightful interactions.

Open demo

Integrations & Workflow

Integrate with Your Stack

Works well with React, Vue, Svelte, or vanilla JS. Renderer-agnostic — use Canvas2D, WebGL, or SVG. Built with developer ergonomics in mind.

React

React hooks and lifecycle-aware bindings.

Networking

State serialization + authoritative steps for multiplayer sync.

Tooling

TypeScript types, unit-testable logic, and performant benchmarks.

Pricing

Plans for Teams & Makers

Hobby

Free, open-source core — perfect for prototypes and learning.

$0

  • Core engine
  • Community support
Get Started
Pro

Commercial features, priority support, and extended examples.

$29/mo

  • Optimized builds
  • Priority community channel
Buy Pro
Enterprise

Custom SLAs, consulting, and integration support.

Contact

Contact Sales

Documentation & Community

Docs, Tutorials & API

Complete API reference, migration guides, and step-by-step tutorials to ship production-ready simulations.

Read DocsAPI Reference
Community

Join Slack, GitHub discussions, and monthly live Q&A sessions.

Contact & Try It

Start a Project

Need help integrating physics into your product? Tell us about your project and we'll reply within 48 hours.

Quick Links