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What you can do with Explainroo

explainroo is a free, open source tool that turns a script and JavaScript scene file into a narrated explainer video or product demo MP4, with the voice, timing and rendering running on your computer.

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vincentsch/explainroo on GitHub

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What do you want to do?

4 use cases

  • Make a narrated explainer video from one topic

    Give a coding agent a topic and get a narrated MP4 with drawn scenes and subtitles.

    View prompt
    Use the explainroo repo at <repo folder> to make a short explainer video about <topic>. Read AGENTS.md and follow its steps so the agent writes script.md and scenes.js and renders an MP4. Expected output: one MP4 under videos/. Verify that the voice reads the script without wrong words before you report the file path.

  • Build a product demo that clicks through your app

    Rebuild your app's screens in Explainroo and film a pointer walking through them.

    View prompt
    In the explainroo repo at <repo folder>, make a product demo for <product name> using its site at <site URL>. Rebuild its screens with the same colors, fonts and button labels, then render an MP4. Expected output: one product demo MP4. Verify that every button label matches the real product before you publish.

  • Render one video in wide and tall sizes at once

    Make one project into a YouTube video and a TikTok or Reels version in one step.

    View prompt
    In the explainroo repo at <repo folder>, render the project at videos/<project> in the wide size and the tiktok size. Expected output: two MP4 files next to each other. Verify that the tall version keeps your text clear of the platform buttons before you upload.

  • Narrate an explainer in another language

    Render the same script with a local voice in Spanish, Japanese or another supported language.

    View prompt
    In the explainroo repo at <repo folder>, write a script in <language> and render an explainer video for <topic>. Expected output: one MP4 narrated in that language. Verify that the speech check reports no wrong words before you report the file path.

How to use Explainroo

  1. Check you have what it needs: Node.js 20.11 or newer; ffmpeg; Chrome or Chromium.
  2. Open vincentsch/explainroo on GitHub and read the README and license.
  3. Clone the repo with git clone https://github.com/vincentsch/explainroo.git
  4. Enter the folder with cd explainroo and install dependencies with npm install
  5. Download the voice and timing models with node bin/explainroo.js doctor --fetch
  6. Start your coding agent in the Explainroo folder and give it the topic prompt below

These steps come from our top use case, Make a narrated explainer video from one topic, which also has a copy-paste agent prompt.

Explainroo alternatives · Best AI repos for Content

About this repo

Requirements

  • Node.js 20.11 or newer
  • ffmpeg
  • Chrome or Chromium
  • About 400 MB of disk space for the voice and timing models, downloaded once
  • A coding agent such as Claude Code or Codex, if you want the agent to write the video
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Questions about Explainroo

What is Explainroo?

explainroo is a free, open source tool that turns a script and JavaScript scene file into a narrated explainer video or product demo MP4, with the voice, timing and rendering running on your computer. It is an open-source project on GitHub: https://github.com/vincentsch/explainroo.

Who is Explainroo for?

Solo creators, marketers and developers who need short narrated videos and whose coding agent can write the script and scene files.

What can I do with Explainroo?

4 use cases so far, for example: Make a narrated explainer video from one topic; Build a product demo that clicks through your app; Render one video in wide and tall sizes at once. Each has steps and a copy-paste agent prompt.

What do I need to run Explainroo?

Node.js 20.11 or newer; ffmpeg; Chrome or Chromium; About 400 MB of disk space for the voice and timing models, downloaded once.

What are alternatives to Explainroo?

Other hot AI repos in Content: Voice Studio, Anatomy, Comfy UI, Hyperframes, Earshot.

Is Explainroo safe to run?

Deduped does not own, audit or vouch for it. Read the README and license, run it on your own systems first and review every command before you run it.