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khan-explainer

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Use when the user wants a Khan Academy style explainer video, a blackboard or whiteboard lesson, a hand-drawn chalk-talk animation, a short narrated video that teaches a concept ("explain X in a video", "explainer video", "teach X in 30 seconds"), or a tutorial that draws hand-written arrows, circles and captions over product screenshots ("draw over the UI", "annotated walkthrough"), or clips cut from a YouTube video or podcast where the speaker's real audio plays under a blackboard drawn to it ("khanify this video", "clip this with the Khan visual"), especially when it must be free, local, and use no paid APIs or keys. macOS only.

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Oct 11, 2026
License
MIT

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# Khan Explainer

A pen draws while a voice explains. Three modes, one renderer:

- **Blackboard lesson.** A diagram drawn on a black board, Khan Academy style.
- **Draw-over-UI tutorial.** Arrows, circles and numbered captions drawn over product screenshots.
- **Real-audio clip.** A real person's voice, cut from a video, with the board drawn to their words. See "Real-audio clips".

One scene file in, one MP4 out, in seconds. Free and local: HTML canvas, Playwright, macOS `say`, ffmpeg. No keys.
Every mode renders as chalk on a blackboard or marker on a whiteboard, landscape or vertical.

Made by Haider Farooq ([github.com/haiderfarooq3](https://github.com/haiderfarooq3/khan-explainer)). Free for anyone to use and change (MIT).

**Core principle: the voice drives the clock.** A scene is a list of beats. A beat is one spoken clause plus the drawing that happens while it is said. The renderer speaks each beat first, measures it, and fits that beat's drawing to it. Never hardcode seconds or guess when a word lands.