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Meta•August 25, 2025
Immersive Web SDK (IWSDK)
Open Source
WebXR
Three.js
AI-Assisted Development
Spatial Computing
### TL;DR
The Immersive Web SDK (IWSDK) is an open-source framework designed to simplify WebXR development by providing a high-performance Entity Component System (ECS) and pre-built systems for physics, spatial audio, and interactions. It features an AI-native development workflow that allows AI agents to see, interact with, and debug 3D scenes in real-time using the Model Context Protocol (MCP).
Key Insights & Metrics
Pricing
Free and open-source (MIT License)
Cost structure
Version
0.5.3
Current release version
Hardware
Web browser with WebXR support; no XR hardware (headset/controllers) required for development due to built-in emulation
Compute requirements
Category
Open Source
Licensing model
Region
United States
Primary region
Key Features
- High-performance Entity Component System (ECS) built on Three.js
- AI-native development workflow with 52 MCP tools for autonomous debugging and scene composition
- Production-ready XR systems including physics, spatial audio, and grab interactions
- First-class spatial UI authoring using UIKitML with HTML-like syntax
- Built-in XR emulation for desktop browsers without requiring VR hardware
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