OpenCaptions MCP Server

by leogaudin Your server? Claim it

local only

OpenCaptions runs on your own machine — the client starts it, so there is no endpoint to ping. Last commit 10 Nov 2026.

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

—

Installs / week

npm · opencaptions

Stars

0 open issues

10 Nov 2026

Last commit

from GitHub

AGPL-3.0

License

TypeScript

Nothing serious here today

Today is the operative word: we check OpenCaptions every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add opencaptions -- npx -y opencaptions

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "opencaptions": {
      "command": "npx",
      "args": [
        "-y",
        "opencaptions"
      ]
    }
  }
}

~/.codex/config.toml

[mcp_servers.opencaptions]
command = "npx"
args = ["-y", "opencaptions"]

.cursor/mcp.json

{
  "mcpServers": {
    "opencaptions": {
      "command": "npx",
      "args": [
        "-y",
        "opencaptions"
      ]
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "opencaptions": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "opencaptions"
      ]
    }
  }
}

Optional settings from the registry entry, left out of the block above: OPENCAPTIONS_KEY (An API key from your OpenCaptions server's Account page, to caption there. Without it the package captions on this computer, with FFmpeg), OPENCAPTIONS_URL (Your OpenCaptions server's web address (http://localhost:5173 when only the key is set)).

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OpenCaptions — questions

Answers built from our own checks of this server.

Why is there no uptime for OpenCaptions?

OpenCaptions runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the npm package opencaptions.

How do I connect OpenCaptions?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It runs locally, so the command pulls opencaptions straight from npm; nothing to host, nothing to sign up for.

Is OpenCaptions open source?

Yes — it is published under the AGPL-3.0 licence, written in TypeScript and 1 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.