What is the key difference between Opus Growth and Callrail MCP?

Opus Growth belongs to the Marketing category with cloud HTTP/SSE execution, while Callrail MCP belongs to the Marketing category with local stdio execution.

How do I install Opus Growth or Callrail MCP 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 Opus Growth and Callrail MCP free or paid?

Opus Growth operates under a Freemium model (OAuth 2.0). Callrail MCP operates under a BYOK (Pay Provider Direct) model (API Key required).

Which MCP server has more tools and community activity?

Opus Growth lists 0 tools with 4 views and 0 GitHub stars. Callrail MCP lists 40 tools with 2 views and 2 GitHub stars.

Can I use both Opus Growth and Callrail MCP 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

Opus Growth vs Callrail MCP

In-depth architectural comparison of the Opus Growth and Callrail MCP 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

Opus Growth

Marketing · Remote HTTP/SSE

Quality: 75/100 (Great) | Auth: OAuth 2.0

Callrail MCP

Marketing · Local stdio

Quality: 60/100 (Good) | Auth: API Key required

Verdict Summary: Choose Opus Growth if you need specialized Marketing tools running via a hosted cloud SSE transport. Choose Callrail MCP if your workspace requires Marketing integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose Opus Growth when:

You need dedicated capabilities in the Marketing domain.
You prefer remote streaming HTTP/SSE transport architecture.
Your security boundary fits: OAuth 2.0 (Freemium).

Explore Opus Growth Details

Choose Callrail MCP when:

You need dedicated capabilities in the Marketing domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: API Key required (BYOK (Pay Provider Direct)).
You have access to required keys: CALLRAIL_API_KEY, CALLRAIL_API_KEY_FILE.
Primary tools included: list_accounts, list_companies, list_trackers.

Explore Callrail MCP Details

Feature & Specification Comparison

Specification	Opus Growth VerifiedMarketing	Callrail MCP pghdma Marketing
Summary	Hosted, OAuth-protected MCP server for advertising operations. One connector covers Google Ads, Meta Ads, Microsoft Advertising, TikTok Ads and LinkedIn Ads, plus Search Console, GA4, YouTube, Tag Manager and Google Business Profile. Every write returns a dry-run preview and is applied only after explicit confirmation.	CallRail REST API v3 integration with 49 tools for call tracking, form submissions, transcripts, full CRUD on tags/trackers/companies/users, plus agency-specific aggregation tools (usagesummary for per-client cost attribution, compareperiods for MoM deltas, bulkupdatecalls with dry-run, spamdetector, calleligibilitycheck for Google Ads conversion debugging). Built by an actual CallRail customer for agency use. Install: pipx install callrail-mcp.

Tools & Capabilities Breakdown

Opus Growth Tools (0)

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

Callrail MCP Tools (40)

list_accounts

List accessible CallRail accounts

list_companies

List companies (clients) under an account. Optional `status="active"` filter and `page

list_trackers

List tracking phone numbers and their source mapping. Optional `status="active"` filter

get_tracker

Full detail for one tracker

list_calls

Paginated call list. Filter by company, date, and `answer_status

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).

Opus Growth Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "opus-growth": {
      "url": "https://mcp.opus-growth.com/mcp"
    }
  }
}

Callrail MCP Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "pghdma-callrail-mcp": {
      "command": "uvx",
      "args": [
        "callrail-mcp"
      ],
      "env": {
        "CALLRAIL_API_KEY": "YOUR_CALLRAIL_API_KEY_HERE",
        "CALLRAIL_API_KEY_FILE": "YOUR_CALLRAIL_API_KEY_FILE_HERE"
      }
    }
  }
}

Frequently Asked Questions

Opus Growth is categorized under Marketing and uses a remote streaming HTTP/SSE transport. In contrast, Callrail MCP belongs to Marketing using local stdio subprocess. Select Opus Growth when you need capabilities focused on marketing and Callrail MCP when you require tools for marketing.

More alternatives to Opus Growth More alternatives to Callrail MCP Marketing category hub