explainroo is out

explainroo lets your coding agent make narrated explainer videos and product demos. You tell the agent what the video should explain. It writes the narration and a bit of JavaScript that draws each scene, and explainroo turns them into an MP4 on your own computer.

The first release has:

• A local voice and word timing, so pictures appear when the voice names them. No account and no API key.
• Five looks: paper, clean, chalk, blueprint and midnight.
• Sizes for YouTube, Shorts, TikTok, Reels, Instagram and LinkedIn, with captions for vertical and square videos.
• Product demos that draw an app’s screens again in its own colors and fonts, with a cursor that clicks and types.
• Checks an agent can use without watching the video: stills, contact sheets, a layout check and a speech check of the final mix.

How explainroo makes a video shows it in 86 seconds. To make your own, start with getting started.