In simple English
This tool makes product demo videos from a simple text description. You ask your coding agent to record a feature, and it writes a plan and runs a browser to record it. The engine adds voiceover, synced captions, and smooth zooming. Because the recording steps are fixed, your continuous integration server can re-record the video whenever your code changes. It costs nothing to run locally if you use the built-in offline voice model.
What it is
A command-line utility and Model Context Protocol server that turns a JSON storyboard into a narrated, captioned MP4 product demo using Chrome and FFmpeg. It acts as an open-source alternative to proprietary screen recording tools by letting your coding agent author the video flow.
What it is good for
Solo builders who want professional product demos and animated GIFs for their README files without spending hours editing screen recordings by hand.
- Re-renders your demo automatically in continuous integration when your user interface changes.
- Works completely offline with zero API keys if you use the local voice model.
- Connects directly to coding assistants via a Model Context Protocol server.
- Requires Node.js 20+, Google Chrome, and FFmpeg installed on your machine.
- Setting up custom voice providers requires external API keys and accounts.
- Debugging broken browser selectors in complex web apps takes time.
manual screen recording and video editor trimming
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npm install cp .env.example .env node examples/local-demo/serve.mjs