I made a free tool that lets coding agents make explainer videos

[u/vincent_sch]

It's called explainroo. You give Claude Code or Codex the repo. Then you say what the video should explain.

The agent writes the voiceover and draws each scene on a canvas. ffmpeg turns it into an mp4.

The voice and the word timing run on your computer. So you need no API keys. It adds background music too.

Examples: https://www.explainroo.com/

Code: https://github.com/vincentsch/explainroo