# KilledByAPixel/LittleJS

Tiny fast HTML5 game engine with many features and no dependencies.

Repository: https://github.com/KilledByAPixel/LittleJS
Canonical: https://ross.abutalabs.com/products/littlejs
Homepage: https://killedbyapixel.github.io/LittleJS/examples
Language: JavaScript
License: MIT
License Family: permissive
Topics: game-engine, js13k, javascript, box2d, game-development, gamedev, littlejs, open-source, typescript, webgl, threejs
Last push: 2026-08-18T15:11:41+00:00

## Health v2 (maintenance only)
Score: 94/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 98, release rhythm 86, longevity 100
- inputs: {"age_days": 1805, "days_push": 15, "days_rel": 18, "gap_med": 34.0, "n_releases_24m": 13}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4166, forks 231 (observed 2026-08-28T04:08:37.894693+00:00)

## What it is
LittleJS is a tiny, fast, open-source HTML5 game engine written in JavaScript with no dependencies. It bundles WebGL2/Canvas2D rendering, arcade and Box2D physics, particles, spatial audio, and input handling in a very small footprint.

## Use cases
- build a 2D browser game
- make a game for js13k size-coding competition
- create a mobile-friendly HTML5 game
- add particle effects and shaders to a web game
- prototype a game with arcade physics
- build a game with Box2D physics in the browser
- make a game jam entry quickly

## When to choose
- you need a lightweight, dependency-free 2D game engine for the web
- you're entering size-limited competitions like JS13k
- you want fast WebGL rendering with a simple API
- you need built-in sound generation, input, and physics out of the box

## When to avoid
- you need a full-featured AAA-grade engine with editors like Unity or Unreal
- your project is primarily 3D and needs a full 3D engine (Three.js support is only a plugin)
- you need console or native platform targets

## Facets
- artifact type: library
- maturity: active
- function: game-engine, graphics, animation, audio-processing, simulation
- domain: web-development, graphics, gaming-tools
- platform: browser, cross-platform
- tags: html5, webgl, canvas2d, box2d, js13k, particles, spatial-audio, typescript, size-coding, no-dependencies, game-development, javascript, web, mobile

## Member repositories
- KilledByAPixel/LittleJS (main) score 94

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:37.894693+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:22:46.028255+00:00, confidence not recorded.
  - readme: https://github.com/KilledByAPixel/LittleJS (fetched 2026-08-28T04:08:37.894693+00:00, sha 4b50860690d1)
  - homepage: https://killedbyapixel.github.io/LittleJS/examples (fetched 2026-08-29T09:13:44.453882+00:00, sha 162c5cc55a98)
- Data as of 2026-08-30T08:39:29.467469+00:00.