What is the key difference between 21st.dev and N3mo?

21st.dev belongs to the Developer Tools category with cloud HTTP/SSE execution, while N3mo belongs to the Developer Tools category with local stdio execution.

How do I install 21st.dev or N3mo in Claude Desktop or Cursor?

Copy the mcpServers JSON configuration snippet provided on this page into your claude_desktop_config.json or ~/.cursor/mcp.json file and restart your AI client.

Are 21st.dev and N3mo free or paid?

21st.dev operates under a Free / Open Source model (No auth required). N3mo operates under a Free / Open Source model (No auth required).

Which MCP server has more tools and community activity?

21st.dev lists 0 tools with 1 views and 0 GitHub stars. N3mo lists 0 tools with 2 views and 25 GitHub stars.

Can I use both 21st.dev and N3mo together in the same MCP host?

Yes! MCP hosts like Claude Desktop, Cursor, Windsurf, Cline, and VS Code support configuring multiple servers under the mcpServers object simultaneously.

Side-by-Side Model Context Protocol Comparison

21st.dev vs N3mo

In-depth architectural comparison of the 21st.dev and N3mo 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.

At a Glance & Executive Verdict

21st.dev

Developer Tools · Remote HTTP/SSE

Quality: 37/100 (Fair) | Auth: No auth required

N3mo

Developer Tools · Local stdio

Quality: 44/100 (Fair) | Auth: No auth required

Verdict Summary: Choose 21st.dev if you need specialized Developer Tools tools running via a hosted cloud SSE transport. Choose N3mo if your workspace requires Developer Tools integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose 21st.dev 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 21st.dev Details

Choose N3mo 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 N3mo Details

Feature & Specification Comparison

Specification	2 21st.dev Developer Tools	N3mo Developer Tools
Summary	Search 21st.dev UI components & themes, get their code, and generate new ones with 21st AI.	N3MO: Code intelligence engine mapping repositories into queryable symbol graphs.
Category & Scope	Developer Tools	Developer Tools
Quality signal

Tools & Capabilities Breakdown

21st.dev Tools (0)

No explicit tool names declared in metadata yet. Check project README on main listing page.

N3mo Tools (0)

No explicit tool names declared in metadata yet. Check project README on main listing page.

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).

21st.dev Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "21st-dev": {
      "url": "https://21st.dev/mcp"
    }
  }
}

N3mo Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "n3mo": {
      "command": "uvx",
      "args": [
        "n3mo"
      ]
    }
  }
}

Frequently Asked Questions

21st.dev is categorized under Developer Tools and uses a remote streaming HTTP/SSE transport. In contrast, N3mo belongs to Developer Tools using local stdio subprocess. Select 21st.dev when you need capabilities focused on developer tools and N3mo when you require tools for developer tools.

More alternatives to 21st.dev More alternatives to N3mo Developer Tools category hub