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How to build a product demo that clicks through your app with Explainroo

Rebuild your app's screens in Explainroo and film a pointer walking through them.

  • Content
  • Advanced
  • 2 hours
  • From the README
  • Claude Code
  • Codex

Reverse engineering. Capturing a live site's screenshots, colors, fonts, logo and wording and rebuilding its screens can copy someone else's product look, so get permission before you publish a demo of a product you do not own.

Who it is forA founder or product marketer who needs a demo video for a web app before a launch or sales call.

The problemScreen recordings of a real app are hard to re-cut, and changing a button label means filming again.

The outcomeA product demo MP4 with screens built from your code or site, your colors and fonts, and a mouse pointer that clicks through the flow.

What you need first

  • Node.js 20.11 or newer
  • ffmpeg
  • Chrome or Chromium
  • About 400 MB of disk space for the voice and timing models, downloaded once
  • A coding agent such as Claude Code or Codex, if you want the agent to write the video

Steps

  1. Complete the install steps with git clone https://github.com/vincentsch/explainroo.git, cd explainroo, npm install and node bin/explainroo.js doctor --fetch
  2. Run explainroo capture against your own live site to save its screenshots, colors, fonts, logo and wording (inferred, check the README)
  3. Tell your agent which product it is and where its code or website lives, then have it rebuild the screens in scenes.js
  4. Render the demo with explainroo render videos/<your-demo> and check the stills for cut-off or overlapping text (inferred, check the README)
  5. Read the layout check output and fix any flagged scenes before you publish

Prompt for your agent

In the explainroo repo at <repo folder>, make a product demo for <product name> using its site at <site URL>. Rebuild its screens with the same colors, fonts and button labels, then render an MP4. Expected output: one product demo MP4. Verify that every button label matches the real product before you publish.

Caveat. The README shows demos for the author's own products and unofficial demos of Gmail, ChatGPT and Claude, and it does not describe any approval process for demos of third-party products.

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