Bolt.new

Bolt.new, built by StackBlitz, is an AI web app builder that runs entirely in your browser: describe an app, and it writes, runs, and previews the code live — no local setup, no waiting for builds. It is the closest thing to having a senior developer pair-programming with you inside a browser tab.

What makes Bolt different is its execution model: instead of generating code you must copy and run yourself, it actually runs the app in a WebContainers environment in your browser, so you see the result instantly. You can then chat with it to fix bugs, add features, and tweak the design, watching each change take effect live.

It supports React, Vue, and other modern frameworks, works with package installs, and can connect to external services. For prototyping, learning web development, or building small-to-medium apps fast, Bolt.new is a favorite among developers and non-developers alike.