Skip to content
Grok

OpenCaptions for Grok

io.github.leogaudin/opencaptions

Animated word-by-word captions for your videos, on your computer or your own OpenCaptions server

client:Grok transport:stdio runtime:npm

Install OpenCaptions in Grok

.mcp.json (in your project root)

Held in this page only — never stored, logged, or sent anywhere but back to your screen.

{
  "mcpServers": {
    "opencaptions": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "opencaptions"
      ],
      "env": {
        "OPENCAPTIONS_KEY": "<OPENCAPTIONS_KEY>",
        "OPENCAPTIONS_URL": "<OPENCAPTIONS_URL>"
      }
    }
  }
}

Grok Build reads Claude Code's .mcp.json and Claude Desktop's config unchanged, so a server you have already set up there needs nothing new. The Grok web app and X integration do not take custom servers. Grok docs

OpenCaptions in other clients