khan-explainer is a free, open-source (MIT) Claude Code skill. You describe the video, Claude writes a scene file, and one command renders an MP4 where a pen draws on a blackboard or whiteboard while a voice explains it.
Here's what it makes, how to install it, what to ask Claude for, and the catches.
What it makes
- Blackboard lesson: a diagram drawn stroke by stroke while the voice explains it.
- Draw-over-UI tutorial: arrows, circles and numbered steps drawn over your own product screenshots.
- Real-audio clip: a YouTube video or podcast in, vertical shorts out, with the board drawn to the speaker's words.
- The voice drives the clock, so the pen never runs ahead of the words.
- Chalk on a blackboard or marker on a whiteboard, landscape or vertical.
Free, for your email
Get the full setup steps + the copy-paste setup prompt
The rest of this guide (4 more sections, 1 copy-paste prompt) opens right here. The setup prompt, one paste into Claude that sets it all up, comes by email only. Use your real address.
Unlocks: Step 1: install it · Step 2: ask for a video · The catch · Sources
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