Now in early access

The game engine built for AI-assisted development.

Modoki is a web-first 2D/3D engine where an AI agent and a visual editor build the game together — entities, scenes, logic, assets. One TypeScript codebase ships to iOS, Android, and the web at 120 FPS.

Play the demos See features →
scene.ts 
// Spawn an entity with traits — runs on iOS, Android, and web.
const player = world.spawn(
  Transform({ x: 0, y: 0 }),
  Renderable({ sprite: 'player.png' }),
  Input({ keys: ['W', 'A', 'S', 'D'] }),
);
Showcase

See what Modoki builds.

Live demos running in your browser — the exact same code that ships to iOS and Android. Click any scene to launch it.

Alien Animal — rigged creature with animation clip selector

Alien Animal

A skinned 3D creature with eight skeletal-animation clips — idle, walk, run, attack, die — switchable live. Showcases the rig + clip system.

▶ Launch
Space Console — toon-shaded spaceship with particle nebula

Space Console

Toon-shaded (NPR) 3D with a live level-of-detail slider, particle systems, and multi-scene loading driven by a camera manager.

Planet Station Warp
Tropical Island — imported 3D model with 2D sprites and UI

Tropical Island

All three render layers at once — an imported 3D island (Three.js), 2D sprites + particles (PixiJS), and ECS-driven DOM UI — composited in a single scene.

Island Skinned rig 2D animation
Chess vs AI — 2D board with on-device LLM opponent AI runs on device

Chess vs AI

A 2D chess board whose opponent is a language model running entirely on the device — it plays and trash-talks. The board is fully playable here; the on-device AI needs the mobile build.

▶ Launch
LLM Test — on-device Gemma chat UI AI runs on device

On-device LLM

A chat UI backed by Gemma running locally via LiteRT — no server, no API key. The interface is built from ECS UI traits; inference runs in the mobile build.

▶ Launch
Sling — the minimal starter template Starter

Starter template

The blank project you get from File → New Project — one sprite, a little UI, nothing else. Where every Modoki game begins.

▶ Launch

Demos load a few MB of WebGL assets on first open. Best viewed on a desktop browser.

Features

Built for the way the web works today.

A modern game engine that treats TypeScript as a first-class language, not a scripting afterthought.

One codebase, every platform

Native iOS and Android shells via Capacitor. Identical TypeScript runs in the browser. Ship once.

Visual scene editor

Dockable Hierarchy, Inspector, SceneView, and Assets panels. Drag-and-drop entity placement and prefabs.

ECS architecture

Pure data-oriented entity-component-system via koota. 15+ built-in traits, auto-generated inspector UI.

Agent-native & deterministic

A headless harness + tick-stamped event journal let an AI agent author and verify game logic by data, not screenshots.

2D and 3D, composable

PixiJS v8 powers high-throughput 2D. Three.js handles 3D. React DOM handles menus. Mix freely in one scene.

Monetization, built in

AppLovin MAX, Adjust, Firebase Analytics, Crashlytics — pre-integrated as first-class Capacitor plugins.

Docs

Learn the editor.

Guides for each part of the Modoki editor — illustrated with screenshots from the real app. Click any guide to read it.

Hierarchy and Inspector

Hierarchy & Inspector

Entities, traits, and the ECS model — live, undoable property editing.

 SceneView and gizmos

SceneView & gizmos

The orbit viewport: translate/rotate/scale gizmos, world/local space, 3D & UI modes.

 Assets and import pipeline

Assets & import

The asset browser, GUID references, and the material / texture / model inspectors.

 Animation curve editor

Animation & curve editor

Keyframe any trait field — Dopesheet timing, Bezier tangent handles, easing presets, live scrubbing.

 Particle editor

Particle editor

Author effects with a live preview — emission, shape, over-life curves, motion, forces.

 Build and deploy

Build & deploy

Ship one TypeScript codebase to iOS, Android, and the web from the Build menu.
120fps
Sustained on mid-range Android
1.1MB
Production web bundle
<200ms
Hot reload latency
3
Render layers: 3D · 2D · UI
Stack

Modern foundations, no surprises.

Tools you already know, composed for real-time game work.

UIReact 19
LanguageTypeScript 5.9
BuildVite 8
2DPixiJS v8
3DThree.js r184
ECSkoota
MobileCapacitor 8
StateZustand

Ready to ship your first game?

Modoki is in early access. Drop your email for installation instructions and release updates.

Request access Play the demos