What is the key difference between Bloomfilter and Castles?

Bloomfilter belongs to the Developer Tools category with local stdio execution, while Castles belongs to the Developer Tools category with cloud HTTP/SSE execution.

How do I install Bloomfilter or Castles 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 Bloomfilter and Castles free or paid?

Bloomfilter operates under a Free / Open Source model (No auth required). Castles operates under a Free / Open Source model (No auth required).

Which MCP server has more tools and community activity?

Bloomfilter lists 10 tools with 0 views and 9 GitHub stars. Castles lists 0 tools with 0 views and 0 GitHub stars.

Can I use both Bloomfilter and Castles 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.

How do I install Bloomfilter or Castles in Claude Desktop, Cursor, or Windsurf?

Both servers follow the standard Model Context Protocol configuration format. Simply copy the JSON block from the configuration section above and paste it into your AI client's mcpServers configuration object (for instance in claude_desktop_config.json or ~/.cursor/mcp.json ), then completely restart or refresh the application.

Are Bloomfilter and Castles free to use, or do they require API keys?

Bloomfilter is listed under a Free / Open Source model with No auth required . Castles operates under a Free / Open Source model with No auth required . If environment variables are required (such as API keys), be sure to define them under the env key in your MCP client's configuration file.

Can I run both Bloomfilter and Castles at the same time in my AI client?

Yes! MCP clients support multi-server orchestration. You can include both bloomfilter and castles as distinct keys inside the single mcpServers object in your configuration file. Your AI assistant will automatically select and call the appropriate tool from either server during chat sessions.

Which MCP server has higher directory engagement and quality ratings?

On AllMCPs, Bloomfilter has a Quality Score of 53 /100 ( Good ) with 0 views, 0 installs, and 9 GitHub stars. Castles holds a Quality Score of 30 /100 ( Emerging ) with 0 views, 0 installs, and 0 GitHub stars.

Side-by-Side Model Context Protocol Comparison

Bloomfilter vs Castles

In-depth architectural comparison of the Bloomfilter and Castles 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

Bloomfilter

Developer Tools · Local stdio

Quality: 53/100 (Good) | Auth: No auth required

Castles

Developer Tools · Remote HTTP/SSE

Quality: 30/100 (Emerging) | Auth: No auth required

Verdict Summary: Choose Bloomfilter if you need specialized Developer Tools tools running via a local process. Choose Castles if your workspace requires Developer Tools integration with remote web transport. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose Bloomfilter 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).
Primary tools included: search_domains, get_pricing, get_domain_info.

Explore Bloomfilter Details

Choose Castles 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 Castles Details

Feature & Specification Comparison

Specification	B Bloomfilter Developer Tools	C Castles Developer Tools
Summary	Service that lets AI Agents search, register, and configure domains	Query 2,400 curated castles, fortresses and palaces: search, nearby, fame ranking. Free, CC0.
Category & Scope	Developer Tools	Developer Tools
Quality signal

Tools & Capabilities Breakdown

Bloomfilter Tools (10)

search_domains

get_pricing

get_domain_info

register_domain

renew_domain

get_account

list_dns_records

add_dns_record

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).

Bloomfilter Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "bloomfilter": {
      "command": "npx",
      "args": [
        "-y",
        "@bloomfilter/mcp-server"
      ]
    }
  }
}

Castles Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "castles": {
      "url": "https://thecastlemap.com/data/"
    }
  }
}

Frequently Asked Questions

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

More alternatives to Bloomfilter More alternatives to Castles Developer Tools category hub