# XR Blocks [](https://www.npmjs.com/package/xrblocks) [](https://bundlephobia.com/result?p=xrblocks)  #### JavaScript library for rapid XR and AI prototyping [Site](https://xrblocks.github.io/) — [Manual](https://xrblocks.github.io/docs/) — [Templates](https://xrblocks.github.io/docs/templates/Basic/) — [Demos](https://xrblocks.github.io/docs/samples/ModelViewer/) — [YouTube](https://www.youtube.com/watch?v=75QJHTsAoB8) — [arXiv](https://arxiv.org/abs/2509.25504) — [Blog](https://research.google/blog/xr-blocks-accelerating-ai-xr-innovation/)

### Description **XR Blocks** is a lightweight, cross-platform library for rapidly prototyping advanced XR and AI experiences. Built upon [three.js](https://threejs.org), it targets Chrome v136+ with WebXR support on Android XR (e.g., [Galaxy XR](https://www.samsung.com/us/xr/galaxy-xr/galaxy-xr/)) and also includes a powerful desktop simulator for development. The framework emphasizes a user-centric, developer-friendly SDK designed to simplify the creation of immersive applications with features like: - **Hand Tracking & Gestures:** Access advanced hand tracking, custom gestures with TensorFlow Lite / PyTorch models, and interaction events. - **Gesture Recognition:** Opt into pinch, open-palm, fist, thumbs-up, point, and spread detection with \`options.enableGestures()\`, tune providers or thresholds, and subscribe to \`gesturestart\`/\`gestureupdate\`/\`gestureend\` events from the shared subsystem. - **World Understanding:** Present samples with depth sensing, geometry-aware physics, and object recognition with Gemini in both XR and desktop simulator. - **AI Integration:** Seamlessly connect to Gemini for multimodal understanding and live conversational experiences. - **Cross-Platform:** Write once and deploy to both XR devices and desktop Chrome browsers. We welcome all contributors to foster an AI + XR community! Read our [blog post](https://research.google/blog/xr-blocks-accelerating-ai-xr-innovation/) and [white paper](https://arxiv.org/abs/2509.25504) for a visionary roadmap. ### Usage XR Blocks can be imported directly into a webpage using an importmap. This code creates a basic XR scene containing a cylinder. When you view the scene, you can pinch your fingers (in XR) or click (in the desktop simulator) to change the cylinder's color. Check out [this live demo](https://xrblocks.github.io/docs/templates/Basic/) with simple code below: \`\`\`html \`\`\` ### Development guide Follow the steps below to clone the repository and build XR Blocks: \`\`\`bash # Clone the repository. git clone --depth=1 git@github.com:google/xrblocks.git cd xrblocks # Install dependencies. npm ci # Build xrblocks.js. npm run build # After making changes, check ESLint and run Prettier npm run lint # ESLint check npm run format # Prettier format \`\`\` XR Blocks uses ESLint for linting and Prettier for formatting. If coding in VSCode, make sure to install the [ESLint extension](https://marketplace.visualstudio.com/items?itemName=dbaeumer.vscode-eslint) and the [Prettier extension](https://marketplace.visualstudio.com/items?itemName=esbenp.prettier-vscode). Then set Prettier as your default formatter. This is not an officially supported Google product, but will be actively maintained by the XR Labs team and external collaborators. This project is not eligible for the [Google Open Source Software Vulnerability Rewards Program](https://bughunters.google.com/open-source-security). ### User Data & Permissions When using specific features in this SDK (e.g., WebXR, hand tracking, camera), users will be prompted with permission requests and the application may not function as expected with denied permissions. XR Blocks is an open source software development kit that does not handle data by itself; however, the use of other APIs may collect user data and require user permissions: When using [WebXR](https://immersive-web.github.io/) and [LiteRT](https://ai.google.dev/edge/litert) APIs (e.g., depth sensing, gesture recognition), all data is stored and processed locally with on-device models. When using AI features (e.g., [Gemini Live](https://gemini.google/overview/gemini-live), Gemini Flash), the data will be sent to Gemini servers and please follow [Gemini's Privacy & Terms](https://ai.google.dev/gemini-api/terms). ### Keep Your API Key Secure This SDK does not require any API keys for non-AI samples. In specific AI use cases, this SDK provides an interface to use cloud-hosted Gemini services with XR experiences, requiring an API key from [AI Studio](https://aistudio.google.com/app/apikey). Please follow [this doc](https://ai.google.dev/gemini-api/docs/api-key#security) for best practices to keep your API key secure. Treat your Gemini API key like a password. If compromised, others can use your project's quota, incur charges (if billing is enabled), and access your private data, such as files. #### Critical Security Rules Never commit API keys to source control. Do not check your API key into version control systems like Git. Never expose API keys on the client-side. Do not use your API key directly in web or mobile apps in production. Keys in client-side code (including our JavaScript/TypeScript libraries and REST calls) can be extracted. ### Uninstallation To remove XR Blocks from your code, simple remove the lines from your \` \`\`\` ### Development guide Follow the steps below to clone the repository and build XR Blocks: \`\`\`bash # Clone the repository. git clone --depth=1 git@github.com:google/xrblocks.git cd xrblocks # Install dependencies. npm ci # Build xrblocks.js. npm run build # After making changes, check ESLint and run Prettier npm run lint # ESLint check npm run format # Prettier format \`\`\` XR Blocks uses ESLint for linting and Prettier for formatting. If coding in VSCode, make sure to install the [ESLint extension](https://marketplace.visualstudio.com/items?itemName=dbaeumer.vscode-eslint) and the [Prettier extension](https://marketplace.visualstudio.com/items?itemName=esbenp.prettier-vscode). Then set Prettier as your default formatter. This is not an officially supported Google product, but will be actively maintained by the XR Labs team and external collaborators. This project is not eligible for the [Google Open Source Software Vulnerability Rewards Program](https://bughunters.google.com/open-source-security). ### User Data & Permissions When using specific features in this SDK (e.g., WebXR, hand tracking, camera), users will be prompted with permission requests and the application may not function as expected with denied permissions. XR Blocks is an open source software development kit that does not handle data by itself; however, the use of other APIs may collect user data and require user permissions: When using [WebXR](https://immersive-web.github.io/) and [LiteRT](https://ai.google.dev/edge/litert) APIs (e.g., depth sensing, gesture recognition), all data is stored and processed locally with on-device models. When using AI features (e.g., [Gemini Live](https://gemini.google/overview/gemini-live), Gemini Flash), the data will be sent to Gemini servers and please follow [Gemini's Privacy & Terms](https://ai.google.dev/gemini-api/terms). ### Keep Your API Key Secure This SDK does not require any API keys for non-AI samples. In specific AI use cases, this SDK provides an interface to use cloud-hosted Gemini services with XR experiences, requiring an API key from [AI Studio](https://aistudio.google.com/app/apikey). Please follow [this doc](https://ai.google.dev/gemini-api/docs/api-key#security) for best practices to keep your API key secure. Treat your Gemini API key like a password. If compromised, others can use your project's quota, incur charges (if billing is enabled), and access your private data, such as files. #### Critical Security Rules Never commit API keys to source control. Do not check your API key into version control systems like Git. Never expose API keys on the client-side. Do not use your API key directly in web or mobile apps in production. Keys in client-side code (including our JavaScript/TypeScript libraries and REST calls) can be extracted. ### Uninstallation To remove XR Blocks from your code, simple remove the lines from your \`