Bolt

StackBlitz

StackBlitz's browser-based AI agent that prompts, runs, edits, and deploys full-stack web and mobile apps entirely in the browser.

Product preview

Overview

Bolt (from StackBlitz) runs its AI app builder entirely in your browser using WebContainers — a full Node.js runtime in WebAssembly. You describe an app, it generates the stack and boots it in a live preview within seconds, no backend round-trips.

It supports a wide choice of frameworks and its open-source core (bolt.diy) lets developers swap in any model. With Expo integration it also targets mobile, making it one of the most flexible prompt-to-app tools for people who want speed without leaving the browser.

Pros / Cons

Pros

Runs entirely in-browser via WebContainers — instant, sandboxed starts
Broad framework support beyond React
Open-source core (bolt.diy) for custom models and self-hosting
Mobile targets via Expo integration

Cons

Browser sandbox limits some backend and long-running workloads
Token credits deplete fast during complex iterations
Large projects can hit in-browser resource ceilings

Who it's for

Instant prototyping without installing anything

Full-stack web apps across multiple frameworks

Teaching environments and hackathon builds

Bottom line

The most flexible prompt-to-app tool for browser-first building — especially if you're not on React.

Key Features

In-browser full-stack dev

Instant preview

One-click deploy

Compare Bolt with alternatives

Bolt vs GitHub Copilot Bolt vs Cursor Bolt vs Windsurf 4 products · Code Generation

Frequently asked questions

What is Bolt?

Bolt is a Code Generation tool developed by StackBlitz. The company was founded in 2024 and is headquartered in San Francisco, USA. StackBlitz's browser-based AI agent that prompts, runs, edits, and deploys full-stack web and mobile apps entirely in the browser.

Is Bolt free?

Bolt uses a freemium model: a free tier is available, and paid plans unlock more usage and advanced features.

Is Bolt open source?

No — Bolt is proprietary software.

What are the best alternatives to Bolt?

Notable Code Generation alternatives include GitHub Copilot, Cursor, Windsurf. Browse all 4 tools in our Code Generation category for a full overview.

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