Bolt.new, released in 2024 by StackBlitz, generates a complete web application from a prompt and runs it immediately inside the browser using WebContainers, StackBlitz's own technology for running a full Node.js development environment client-side without a remote server. That in-browser execution is what separates it technically from competitors that generate code but still need a separate deployment step to actually run it.
A user can watch the generated app build and run live, make follow-up requests to adjust it, and see changes reflected immediately in the same browser tab, a tighter feedback loop than tools where generation and execution happen in separate steps or environments. Deployment to a live URL is available directly from the same interface once a project is ready.
A free tier covers limited monthly usage, and paid plans start around $20 a month for more generation capacity. For someone who wants to see a generated app actually running immediately, rather than only the code that would theoretically run it, Bolt.new's WebContainer-powered, in-browser execution is a specific technical advantage StackBlitz's underlying technology enables directly.
