AI product Open source
fx0 is an open-source web application and lightweight design agent from Vercel Labs, built with libfx. A user describes a page and the agent produces it as a single HTML file, with a live sandboxed preview, design editing and publishing tools, web search and page-fetching tools, and optional subagents.
The app stores chats and design versions, allowing previous versions to be reopened or downloaded. libfx supplies the agent loop, streaming, tool calls, retries and durable sessions; on Vercel, Vercel World and Vercel Queues let a turn continue after the function handling it crashes or reaches its time limit. Model calls are billed through Vercel AI Gateway using the signed-in user's team, with an optional sponsored trial. The repository includes local setup and deployment instructions using Node.js, Neon Postgres and Upstash Redis. It is licensed under Apache-2.0; its bundled design styles come from VoltAgent's awesome-design-md under the MIT license.
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An open-source web app and design agent built with lib FX that writes pages as single HTML files with live preview in a sandbox frame, keeping every design version, with durable chats that resume after crashes and model calls billed through Vercel AI Gateway.
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