StackBlitz's in-browser AI web app builder — generate, run, and deploy full-stack apps instantly.
Bolt.new is StackBlitz's in-browser app builder, and the in-browser part is not a detail. It runs on StackBlitz's technology for executing a real development environment inside the browser tab, so the app you describe is generated, installed, and running in front of you within the same page, with no local setup and nothing to configure first. You prompt it, watch the project come together, see the preview update, and keep refining in conversation. It handles full-stack web projects rather than static pages, and deployment is available from the same session, so the path from idea to a link you can send someone is short. The tradeoff of that model is that everything happens in the environment Bolt provides, which is exactly what makes it fast to start.
Reach for Bolt.new when speed of first result matters more than anything else. It is the right tool for testing an idea in an afternoon, building a demo before a meeting, or producing a working prototype to show instead of describe. It suits people without a local development setup, and developers who simply do not want to scaffold another project to try something small. The browser-based environment removes the entire install step, which is often what kills a quick experiment. It fits less well for long-lived applications with complex infrastructure, heavy background processing, or specific hosting requirements. Once a project stops being an experiment, most people move it into a normal repository and a normal toolchain.
Lovable is aimed at iterating a web product conversationally over a longer arc, so it is the better fit when the app is meant to keep growing rather than prove a point. v0 is narrower and focused on generating interface components you pull into your own project, which is a different job entirely: it produces pieces, not a running app. Replit Agent is the closest structural comparison, since it also builds inside a hosted environment, but it puts a full development workspace around the work with more visible tooling. Bolt.new's advantage is immediacy, the tab is the environment, and the distance between prompt and running app is as short as this category gets.
Compare with: Lovable, v0, Replit Agent
The catalog records Bolt.new as freemium. In practice that means you can open it and build something without paying, which suits the kind of quick experiment the tool is designed for, while paid plans cover heavier and sustained use. Products in this category typically meter on generation usage rather than seats, so cost tends to follow how much you build rather than how long you keep an account. If you plan to use it regularly, check the current plan page, since usage-based limits change more often than flat tiers.
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