R3 vs Open MCP Apps

In-depth architectural comparison of the R3 and Open MCP Apps MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

R

Choose R3 when:

• You need dedicated capabilities in the Developer Tools domain.
• You prefer remote streaming HTTP/SSE transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore R3 Details

Choose Open MCP Apps when:

• You need dedicated capabilities in the Developer Tools domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore Open MCP Apps Details

Feature & Specification Comparison

Specification	R R3 Developer Tools	Open MCP Apps Developer Tools
Summary	Build interactive 3D web apps — scenes, physics, audio and music — from composable components.	Interactive MCP Apps the AI builds once and you both reuse — data outlives the chat
Category & Scope	Developer Tools	Developer Tools
Quality signal

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "r3": {
      "url": "https://r3js.org"
    }
  }
}

{
  "mcpServers": {
    "open-mcp-apps": {
      "command": "npx",
      "args": [
        "-y",
        "@2nd1st/open-mcp-apps"
      ]
    }
  }
}

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