Platform

One SDK. A real engine underneath.

RealityOS pairs a Rust engine that renders with WebGPU with a TypeScript SDK in the idioms three.js developers already know. Multiplayer, 3D assets and on-device AI come built in.A WebGPU engine and one TypeScript SDK, with sync and on-device AI built in.

Get started For developers

Engine

Rendered with WebGPU

A compact Rust core does the heavy work: rendering, the scene, assets and sync. It compiles to WebAssembly for the browser and to native code for desktop.A Rust core, compiled for the browser and for desktop.

Physically basedMaterials, lights and reflections that look right out of the box.Physically based. Looks right by default.
Compressed 3D assetsglTF models with compressed textures load fast and stay small.Fast assets. Compressed glTF.
Web firstRuns in browsers with WebGPU, with no install.Web first. No install.

A meeting room with a round table, chairs and tall city windows, rendered in the browser by the RealityOS engine — Rendered in the browser by RealityOS

SDK

Code that feels familiar

The SDK is the only thing anyone programs against: apps, tools and agents alike. Scenes, meshes, lights and cameras work the way three.js developers expect.Scenes, meshes and lights, the way three.js developers expect.

Batteries includedOrbit controls, glTF models, text and UI panels, and surfaces people can draw on.Batteries included. Controls, models, UI panels.
Scenes as filesLoad or save a whole scene as typed JSON.Scenes as files. Typed JSON.
Typed throughoutTypeScript types for every part of the API.Typed. Every part of the API.

main.ts

import { Engine, Scene, PerspectiveCamera, DirectionalLight,  Mesh, BoxGeometry, MeshStandardMaterial } from 'realityos' const engine = await Engine.create({ canvas })const scene = new Scene() const camera = new PerspectiveCamera(60)camera.position.set(2.5, 1.8, 2.5)camera.lookAt(0, 0.5, 0) scene.add(new DirectionalLight({ direction: [-1, -2, -1], intensity: 2.5 }))scene.add(new Mesh(new BoxGeometry(1, 1, 1),  new MeshStandardMaterial({ roughness: 0.4 }))) engine.render(scene, camera)

Multiplayer

Shared scenes, in sync

Everyone in an app sees the same scene. Apps declare which parts are shared, and our sync service on the edge sends only what changed.Everyone sees the same scene. Only changes travel.

Declared, not wiredMark what is shared; the SDK keeps it in sync.Declared. Mark what is shared.
Only changes travelSmall updates instead of whole scenes.Small updates. Only changes travel.
People and agents togetherAn AI agent can change the same scene people are in.Together. People and agents, one scene.

A personIn the browser

Sync on the edge

A change

One shared scene

Only the change

An AI agentSame scene

AI on the device

Built into the engine

Vision and audio models run in the engine on the user's own GPU and CPU. Camera and microphone data stay on the device.Runs on the device. Camera and mic data stay there.

Person cut-out

Removes the background from a camera feed on the GPU.

Face and head

Finds faces and follows head pose.

Hand gestures

Recognises hand gestures for control.

Auto-framing

Keeps a person well framed as they move.

Clean speech

Removes background noise from the microphone.

Assets and platforms

From upload to every screen

Asset service

Upload, store and serve 3D assets from one service.Upload, store and serve 3D assets.

Web

Today

Browsers with WebGPU, such as Chrome and Edge.

Desktop

Native apps for Windows and macOS.

Mobile

After

Native apps for iOS and Android.

Where it comes from

Years of engine work underneath

The RealityOS engine started as the TMRW Engine, which ran ROOM and AiredTV in the browser. Today's engine is its successor, rebuilt for WebGPU and for coding agents.It started as the TMRW Engine behind ROOM and AiredTV.

Then
TMRW Engine
C++ and WebGL. Ran ROOM and AiredTV.
Now
RealityOS engine and SDK
A Rust core on WebGPU, one TypeScript SDK. HOLOH is moving onto it; IndieBox and Plasmon Studio are building on it.

Get started

Request access

RealityOS is invite-only for now. Requests open at launch. Write to info@holoh.com meanwhile.

Free to build and test. Evaluation terms

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