bolt.new

Type: no-code · Vendor: StackBlitz · Language: TypeScript (WebContainer) · License: MIT · Status: active · Status in practice: mature · First released: 2024-10-03

Links: homepage docs repo

Browser-hosted AI coding agent that prompts, runs, edits, and deploys full-stack web apps inside a StackBlitz WebContainer, giving the model complete control over filesystem, Node server, package manager, terminal, and browser console.

Description. bolt.new is StackBlitz's prompt-to-app product. It pairs a frontier LLM with a WebContainer — a Node.js runtime running entirely in the browser — so the agent can install npm packages, run dev servers, edit files, and deploy without provisioning a remote VM. The model is given complete control of the in-browser environment; the user iterates via chat, with diffs visible and a one-click deploy path. The repo hosts the open-source app shell behind bolt.new; the hosted product additionally bundles auth, database, hosting, and design-system imports.

Agent loop shape. Single-agent chat-driven loop where the model is wired to a WebContainer instance. Each turn the agent emits file edits and/or shell actions; the WebContainer applies them, installs packages, starts the dev server, and streams output back to the agent. Errors and console output are fed back into the next turn. Deploy and share are explicit tool actions exposed in the same conversation surface.

Primary use cases

browser-based prompt-to-app for full-stack web projects
in-browser Node.js dev environment with no local setup
rapid prototyping with one-click deploy and shareable URLs
AI-driven npm install, dev server, and code editing inside the page

flowchart TD user[User prompt] --> agent[LLM coding agent] agent --> wc[WebContainer] wc --> fs[Filesystem] wc --> npm[npm / package manager] wc --> term[Terminal] wc --> node[Node server] wc --> console[Browser console] fs --> obs[Observed output] term --> obs node --> obs console --> obs obs --> agent agent --> deploy[Deploy / share URL]

Key concepts

WebContainer → code-execution (docs) — In-browser Node.js runtime that hosts the project, package manager, and terminal.
Full-environment AI control → tool-use (docs) — Model has complete control over filesystem, Node server, package manager, terminal, and browser console.
Prompt-to-app → spec-driven-loop (docs) — Chat-driven generation of a working full-stack project from a natural-language prompt.
Deploy from chat (docs) — One-click deploy and shareable URL from the same chat surface.

bolt.new

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