Pure ECS
data-oriented
A true Entity-Component-System foundation — not an OOP engine with ECS bolted on. One component per type per entity. Memory layout is predictable. Component queries are instantaneous, even with millions of entities.
ECS engine,
built for performance.
A JavaScript ECS engine with a zero-allocation core. Runs a million entities on low-spec hardware without GC stutter. No editor, no scene files — just code.
$
npm install @woosh/meep-engine 1,000,000
objects · 60 fps
0
Allocations per frame
4,000+
Handwritten tests
4,500+
Runtime assertions
Why Meep
Most web engines are heavy, opinionated, and stutter.
Meep is built around a different premise: that web games can rival native code if you take memory layout, cache locality, and bundle size seriously. Every decision in the engine bends toward that goal.
Zero-garbage architecture
no GC spikes
Custom memory management eliminates the per-frame allocation pattern that destroys frame consistency on the web. Meep handles millions of objects on low-spec mobile without GC pauses.
Fast cold start
boots first, streams next
The engine ships as ~3,000 fine-grained ES modules that tree-shake to only what you reference. On the web that matters less for total payload size — your textures and meshes will dwarf the engine anyway — and more for cold start: the engine is parsed and running in milliseconds, so asset streaming begins sooner.
Code-first, no editor
programmatic
No GUI. No proprietary file formats. Meep is built for engineers who treat their codebase as the source of truth. Edit code, not opaque scene files.
Forward+ rendering
clustered lighting
Thousands of point lights. 1,000,000+ GPU-driven decals. A particle system compiled into just 4 shaders to eliminate state-switching overhead. Plus a pure-JS path tracer for offline.
Hierarchy: solved
parent-child transforms
Pure ECS engines historically struggle with scene graphs. Meep gives you the composability of a hierarchy with the raw speed of a flat array — without compromising either side.
AI & simulation toolkit
rare in JS
Behavior trees, blackboards, Monte-Carlo Tree Search (AlphaGo's algorithm), resource allocation solvers, FABRIK IK, BVH spatial queries. Industrial decision-making tools.
Battle-hardened
decade in production
Powers Might is Right on Steam. 4,000+ handwritten tests cover critical algorithms and edge cases. 4,500+ assertions in dev mode catch errors instantly; stripped from production builds.
Production builds
Invisible at runtime.
In development, Meep runs with thousands of assertions to catch errors at the source. For production, a single Rollup plugin strips every assertion away. What ships is small, tight, and runs at the speed of light.
- ✓ Tree-shakes to only the modules you reference
- ✓ Zero runtime overhead from assertions
- ✓ Optional Three.js peer dep — opt in only if you need it
- ✓ Targets last-2 versions of Chrome, Firefox, Safari
import { defineConfig } from "vite";
import strip from "@rollup/plugin-strip";
export default defineConfig({
plugins: [
{ ...strip({ functions: ["assert.*"] }), apply: "build" }
]
}); Get started
Read the source. Build something.
Free for hobby and small commercial work. One-time, per-project pricing for everyone else — including studios. No seats, no annual contracts.