Browser runtimes for AI coding CLIs, Node.js, Rust, Python, C/C++, Java, Flash, and x86 binaries via WebAssembly.
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Run AI code securely on any device
Website · Repository · Documentation · Changelog
- Sandboxed server runtimes that run entirely client-side, on a Linux-compatible kernel in WebAssembly
- Node.js and Rust, with Python in preview. Ruby and Go are in development
- Ships bash, git, curl, ripgrep, fd and core Linux utilities, plus npm, npx and pnpm for Node.js
- Runs the frameworks and build tools you already use, such as Next.js 16, Vite 8, React, Nuxt and Express
- Real Linux process behaviour: pseudo-terminals, signals,
/devand/proc, and scripts that run as executables - Run multiple processes and threads concurrently, with memory that grows only as programs need it
- Expose a running dev server at a public URL with Portals, WebSockets included
- Persistent or ephemeral filesystem on OPFS or IndexedDB, with multiple independent virtual disks
- Built for AI agent sandboxes, web IDEs, interactive tutorials and runnable documentation
A browser-based coding playground, fully client-side
Live demo · Repository · Announcement
- Start from a framework template (Vite, React, Svelte, Vue, Next.js, Nuxt, Express) or clone any GitHub repository
- Run Claude Code, Codex CLI and Pi, with Antigravity, OpenCode and more coming soon
- File tree, code editor, terminal and live preview, with bash and git
- Share what you build at a public URL with Portals
- Embed it in your docs, tutorials or landing pages
- Built on BrowserPod, at near-native speed with instant startup
- Free and open source
A Linux virtual machine that runs entirely in the browser
- Runs an unmodified Debian distribution, with many native development toolchains
- Built on CheerpX, our x86 virtualization engine
- Networking through Tailscale: reach your private network and, with an exit node, the internet
- A graphical Alpine desktop with Xorg and i3
- Works with Claude, using your own API key
- Fork it to deploy your own, with custom images
Run virtual machines in your web apps
Website · Repository · Documentation
- A JavaScript library that runs unmodified x86 binaries in any browser, client-side
- An x86-to-WebAssembly JIT compiler that handles dynamically generated and self-modifying code
- A virtual block-based file system and a Linux syscall emulator, enough to run complete Linux distributions
- Sandboxed by WebAssembly and the browser, even for untrusted code
- The engine behind WebVM
- CheerpX for Flash runs Flash Player, so Flash content works in modern browsers
- Free for personal and open-source projects
Real Java in the browser
Website · Repository · Documentation · Playground
- A full OpenJDK distribution in WebAssembly, with a JVM that runs your bytecode unchanged
- Supports Java 8, 11 and 17
- Run existing applications, applets, Java Web Start apps, and Oracle Forms and E-Business Suite clients, from unmodified JARs
- Integrate Java libraries in JavaScript, fully client-side
- Swing and AWT interfaces drawn with HTML elements and canvases
- One script tag loads it, from our CDN or your own server. Works in Chrome, Edge, Firefox and Safari
- Browser extensions run applets and Java Web Start apps in Chrome and Edge, for 170,000+ users
- 1M+ sessions a month from our public CDN
- An agent skill for coding agents bringing Java apps to the browser
An enterprise-grade, open-source C/C++ compiler for WebAssembly and JavaScript
Website · Repository · Documentation
- Port C/C++ libraries and applications to the browser, with the right JavaScript interfaces exposed
- Write high-performance web applications and WebAssembly components in C++
- Built on LLVM/Clang and tracks upstream, with custom optimisations for speed and output size
- Apache 2.0 licence with LLVM exceptions, the same as LLVM/Clang