Bolt.new
by StackBlitz
Open Source
AI Coding
Browser-Based
by StackBlitz
Build full-stack applications entirely in your browser with no setup required. Open-source, free, and powered by WebContainers technology.
Bolt.new is an open-source AI full-stack development environment by StackBlitz that runs entirely in the browser using revolutionary WebContainers technology. Unlike traditional development tools that require complex local setups, Bolt allows you to build, run, and deploy complete applications directly from your browser with zero installation.
Built on StackBlitz's groundbreaking WebContainers - a Node.js runtime that executes inside the browser using WebAssembly - Bolt.new represents a fundamental shift in how we develop software. With over 1.68 million applications built and completely free open-source licensing, it's democratizing full-stack development for developers worldwide.
What sets Bolt apart is its unique architecture: everything runs client-side in your browser. There are no remote servers executing your code, no VMs to provision, no Docker containers to manage. Your development environment boots in milliseconds, your code executes at near-native speeds, and your data never leaves your machine - all while providing the full power of Node.js, npm packages, and modern frameworks.
Complete development environment running entirely in your browser. No installation, no configuration, no local setup required. Just open and start coding.
Powered by StackBlitz's WebContainers - the first Node.js runtime in the browser. Run npm packages, build tools, and servers at near-native speeds using WebAssembly.
Build with React, Vue, Angular, Svelte, Next.js, Vite, or any npm-based framework. Bolt supports the entire modern JavaScript ecosystem out of the box.
Forget about Node installation, environment variables, or dependency conflicts. Everything runs isolated in your browser with instant boot times.
See changes instantly with hot module reloading. Your app updates in real-time as you code, with full DevTools integration and debugging support.
Export your code to GitHub, deploy to Netlify, Vercel, or any hosting provider. Full source code access means zero vendor lock-in.
At the heart of Bolt is WebContainers - a revolutionary technology that runs a complete Node.js environment inside your browser using WebAssembly. This isn't a simulation or emulation; it's a real operating system with a virtual file system, networking layer, and process management, all running client-side at near-native performance.
Describe what you want to build in natural language, and Bolt generates the complete application structure. The AI understands modern development patterns, best practices, and framework-specific conventions, creating production-quality code from your descriptions.
Bolt provides a full-featured IDE with syntax highlighting, IntelliSense, debugging, terminal access, and version control - all running in your browser. Edit files, run commands, install packages, and manage your project without leaving the browser window.
WebContainers boot in milliseconds and run development servers at near-native speeds. Your apps load faster than traditional local development because there's no file system overhead or network latency between your code and the runtime.
Because WebContainers run real Node.js, you get access to the entire npm ecosystem. Use any build tool (Vite, webpack, Rollup), any framework (React, Vue, Svelte), and any npm package - exactly as you would locally.
Bolt.new is entirely free and open source under the MIT license. StackBlitz monetizes through enterprise offerings of the underlying StackBlitz platform, but Bolt.new itself has no paid tiers or usage restrictions.
| Feature | Bolt.new | Lovable.dev | V0.dev | Cursor AI |
|---|---|---|---|---|
| Full-Stack Generation | Complete | Complete | Frontend Only | Code Assistant |
| Open Source | MIT License | Proprietary | Proprietary | Proprietary |
| Browser-Based | 100% | Web IDE | Web IDE | Desktop Only |
| WebContainers | Native | Remote VMs | Remote VMs | Local Only |
| Pricing | Free (OSS) | $20/month | $20/month | $20/month |
| Best For | Privacy & Open Source | Complete MVPs | UI Components | Experienced Devs |
Bolt.new is a revolutionary development platform that brings the full power of Node.js development to the browser. As a completely free, open-source alternative to commercial AI coding tools, it democratizes access to modern development workflows without vendor lock-in or subscription fees.
The WebContainers technology is genuinely groundbreaking - running a complete Node.js environment in the browser opens possibilities that were impossible just a few years ago. For developers who value privacy, open source, and freedom from commercial platforms, Bolt.new is an exceptional choice.
The trade-offs are real: browser-based development has performance constraints compared to native tools, the UI isn't as polished as commercial alternatives, and the community is smaller. For very large or complex projects, you might hit browser memory limits. But for the vast majority of web development - from MVPs to production apps - Bolt.new delivers remarkable capabilities.
If you're building web applications and value open source, privacy, and zero-setup development, Bolt.new is outstanding. The fact that it's completely free makes it a no-brainer to try. Even if you use commercial tools as your primary workflow, Bolt.new is invaluable for quick prototypes, sharing reproductions, or developing on machines where you can't install Node.js.
Rating: 9.0/10 - The best open-source AI development tool available in 2026, and unbeatable value for a free platform.
Start developing full-stack applications in your browser with no installation required