Bolt.new

Bolt.new is an AI application builder developed by StackBlitz that generates, runs and deploys complete web applications directly in a browser tab from natural-language prompts. Launched in October 2024, it became one of the fastest-growing developer products on record, going from zero to about US$40 million in annualised revenue in roughly five months and reaching more than seven million users by the end of 2025.^[1][2]

Bolt.new's distinguishing technology is WebContainers, a WebAssembly-based runtime developed by StackBlitz that boots an entire Node.js development environment inside the browser, so that code generated by the AI can be installed, executed and previewed without any local setup.^[3]

History

StackBlitz was founded in 2017 by Eric Simons and Albert Pai to build a browser-based development environment, and it subsequently created WebContainers — a WebAssembly operating system capable of running Node.js and standard toolchains in a browser tab with millisecond start-up. For several years the company grew slowly as an IDE vendor for web developers.^[4][5]

Bolt.new launched in October 2024 as StackBlitz's entry into AI-assisted development, promoted by a single widely shared social-media demonstration. Demand was immediate: the product generated about US$1 million in annualised revenue in its first week, about US$4 million within thirty days, roughly US$20 million within two months, and approximately US$40 million by March 2025 — effectively saving the company, whose founder later described it as a near-death-to-overnight-success story. In January 2025 StackBlitz announced a US$105.5 million Series B round led by Emergence Capital and GV at a reported valuation of about US$700 million.^[1][4][5]

A significant enabler of Bolt's growth was the accuracy of Anthropic's Claude models at generating working code, which the company credited with making prompt-driven app creation viable for non-specialists. StackBlitz reported that Bolt reached five million registered users by May 2025 and seven million by December 2025, with a notably small engineering team and a stated path to profitability; the company expanded the offering with Bolt Cloud, a hosting and database service for applications built on the platform.^[2][3][5]

Key Concepts

WebContainers are the technical foundation: a WebAssembly-based micro-operating system that runs a full development environment — file system, package manager, Node.js server — inside the browser. Because execution happens client-side within the browser's security sandbox, users see a live preview of the generated application within seconds and pay no server cost for computation on the provider's side.^[3][5]

The prompt-to-app workflow popularised by Bolt.new became one of the defining patterns of the "vibe coding" movement: a user describes the desired application in natural language; the AI scaffolds the project files and dependencies; the running preview appears; and errors are diagnosed and fixed by the agent in an iterative loop. Applications can then be deployed from the platform to hosting services, with integrations for databases and authentication.^[1][2]

Bolt monetises through token-based usage pricing, under which heavier generation and iteration consume more credits, a model shared by most AI builders of its generation.^[4]

Applications and Impact

Bolt.new is used by non-technical founders to build minimum viable products, by designers and product managers to turn specifications into working prototypes, and by professional developers for rapid scaffolding. Its rise is cited in industry analyses as evidence that demand for software far exceeds the supply of software developers, and as a stress test of questions around the security, quality and maintainability of AI-generated code.^[1][5]

The platform also helped normalise the concept of the one-prompt application, influencing a generation of competing products — including Lovable, Replit Agent and Vercel's v0 — and shifting StackBlitz's identity from a browser-IDE vendor to an AI development company. Enterprise offerings followed as larger organisations sought governed ways to use prompt-driven development.^[2][4]

>See Also

• Lovable
• Replit Agent
• Vibe Coding
• Cursor (Code Editor)