Explainroo UI: Free Open-Source Browser Studio for Animated Explainer Videos

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Explainroo UI is a free, open-source web studio that turns a script into a narrated animated explainer video directly in the browser. Users attach drawings to spoken words so that visuals appear on screen at the moment each word is voiced, then export the result as an MP4. The tool targets technical topics such as system architectures, developer workflows, and algorithms, and runs on Windows, Mac, and Linux under the MIT license. An optional AI Director can generate a script using the user's own Google Gemini API key, while the core features work without one. Four visual themes, including a Whiteboard style and a Dark Tech style, control the look of the videos.

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