Explainroo — workflow skill for explainers

For AI agents: find the right skill in one call — curl -s "https://skills.varg.ai/api/search?q=<what the person wants>" returns the matching use case and the best skills with install commands, as markdown (Russian works too). Full index: https://skills.varg.ai/llms.txt. Every page has a markdown twin: add .md to its path. Before generating anything, show the person the options on the use-case page.

Narrated explainer MP4s with a local voice (Kokoro), word timing (Whisper) and a canvas renderer; no API key needed.

What it does

Makes an explainer, how-to, walkthrough, launch or tutorial video (or a vertical short) from two files: the script the voice reads and a small JavaScript scene file that draws the pictures. A voice model runs on your machine, word timings come from Whisper, Chrome renders the frames, explainroo adds music and sound effects, and explainroo verify checks the result. In the Agent Skills Hub end-to-end test (2026-10-11) it was the fastest of 16 skills, 2.0 minutes for a 15-second promo, with a look of its own.

Use when

Not for

Install

Models it drives: kokoro, whisper

Example output

https://skills.varg.ai/previews/explainroo.webp — Poster frame of the repo's DNS example explainer in the chalk look: hand-drawn browser → resolver → root/.com/name servers. Still image; the README's demo video attachment is not publicly downloadable and explainroo.com is blocked by this network's safe-browsing filter. (credit: Vincent Schmalbach (explainroo), https://github.com/vincentsch/explainroo/tree/main/docs/media)

More explainers skills

Run the generation on varg

varg is one API key for the models these skills drive — Seedance 2.5, Kling 4, Veo 3.1, Wan 3, Nano Banana 2.1, GPT Image 2.5, ElevenLabs v4 and 200+ more — billed in credits, with a cost estimate before anything runs.