Companies House vs True Solar Time

In-depth architectural comparison of the Companies House and True Solar Time 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?

Choose Companies House 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).
• You have access to required keys: COMPANIES_HOUSE_API_KEY.
• Primary tools included: Company and officer search, Company profiles and statutory records, Ownership, appointments and disqualification lookup.

Explore Companies House Details

Choose True Solar Time 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: Historical IANA time-zone and DST correction, Longitude-based solar-time adjustment, Equation-of-time calculation.

Feature & Specification Comparison

Specification	Companies House Developer Tools	True Solar Time Developer Tools
Summary	MCP server and CLI for the UK Companies House API. Search, filings, officers, due diligence.	True solar time correction for BaZi charts: historical DST, longitude, equation of time.
Category & Scope	Developer Tools	Developer Tools

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": {
    "companies-house": {
      "command": "npx",
      "args": [
        "-y",
        "companies-house-mcp"
      ],
      "env": {
        "COMPANIES_HOUSE_API_KEY": "YOUR_COMPANIES_HOUSE_API_KEY_HERE"
      }
    }
  }
}

{
  "mcpServers": {
    "true-solar-time": {
      "command": "npx",
      "args": [
        "-y",
        "true-solar-time"
      ]
    }
  }
}

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