Bolt.new

Bolt.new is a browser-based AI full-stack builder that turns text descriptions into working web applications — complete with frontend, backend, and database. You describe what you want to build, and Bolt generates the code, runs it in an in-browser environment, and lets you iterate in real time. No local setup required.

**What Bolt Does**

Bolt takes a prompt like "build a todo app with user accounts and a PostgreSQL database" and produces a running application: React or Next.js frontend, Node.js or Express backend, configured database connections, and environment variables. You can see the app running live in a preview panel while editing the code in the adjacent editor, creating a tight loop between prompts, code, and live output.

Beyond initial generation, Bolt supports follow-up prompts to add features, fix bugs, or adjust styling. It can install npm packages, run shell commands, and access a file system within its sandboxed environment. When you're ready to ship, you can connect a GitHub repository and deploy to Netlify or Vercel in one click.

**Who Uses Bolt**

Bolt is primarily used by non-engineers building internal tools, quick prototypes, and weekend projects where the goal is a working app fast rather than a production-scale codebase. It's popular among product managers, startup founders, and marketers who understand what they want to build but lack the engineering bandwidth to write it from scratch. It's also used by developers for rapid prototyping before writing a "real" implementation.

**Strengths**

The browser-based, zero-setup experience is Bolt's strongest selling point. You can go from idea to running prototype in minutes without configuring a local development environment. The in-browser preview that updates in real time gives immediate feedback on whether the app behaves as expected. For non-technical users, this is significantly more accessible than Aider or Cursor, which require developer-level setup.

**Limitations**

Bolt-generated code is often acceptable for prototypes but isn't production-ready without review and refactoring. The sandbox environment has limits on what can run in-browser — complex microservices architectures, custom infrastructure, and specialized backend requirements push past what Bolt handles well. The token costs on the $20/month plan can be exhausted quickly on complex projects.

**Alternatives**

v0 by Vercel covers front-end component generation with stronger React/Next.js depth. Replit Agent offers a similar browser-based approach with more emphasis on backend and deployment. Lovable positions itself as the friendliest option for non-technical users building consumer apps. For engineering teams working in existing codebases, Cursor and GitHub Copilot remain the professional standard.