Open source Swift + Metal macOS · iOS · visionOS

Full control over rendering. Built for spatial computing.

An open-source Swift and Metal engine for games, XR experiences and spatial visualization on Apple platforms — with direct access to shaders, rendering techniques and engine architecture.

SwiftMetalDeferred rendererPBR + IBLSkeletal animationPhysics1,000+ automated tests

Build beyond the screen

From immersive games to real-world visualization.

Explore the showcase →

Apple Vision Pro apps

Experiences that blend virtual content with the physical space around you.

Architecture & simulation

Architectural environments, simulations and industrial visualization at real scale.

Immersive games

Games for Mac, iPhone, iPad and Vision Pro, on a renderer you can reshape.

Features

A rendering foundation you can actually control.

Modern rendering

Physically based materials, dynamic lighting, shadows, image-based lighting, post-processing and direct shader access.

Animation & physics

Skeletal animation, character deformation, physics simulation and collision detection.

Spatial computing

Vision Pro experiences that blend virtual content with physical spaces.

Extensible by design

Add custom components and integrate specialized systems without fighting the engine.

Native Apple development

Written in Swift on Metal, supporting macOS, iOS and visionOS.

Built for reliability

Over 1,000 automated tests across rendering, animation, streaming and physics, plus rendering diagnostics.

Why Untold

When you need more than a high-level framework.

Reach for RealityKit when…

  • You want the fastest path to a first scene
  • Apple's built-in rendering covers what you need
  • You'd rather not own the pipeline

Reach for Untold Engine when…

  • You need to write and control your own shaders
  • You want to change how the renderer itself works
  • You want open, native source you can read and extend

Untold Engine Studio

A visual editor when you want it. Code when you don't.

  • Build and compose scenes
  • Configure materials and lighting
  • Manage assets for macOS and visionOS projects

Custom rendering & spatial computing work.

Specialized rendering, performance optimization and custom engine extensions for industrial visualization, Vision Pro and simulation projects — from the engine's creator.

Discuss your project →

Start building with Untold Engine.

Free and open source. Clone it, read it, bend it to your project.

 

Cart (0)