What is the key difference between Caldav MCP and Inbox Zero?

Caldav MCP belongs to the Workplace & Productivity category with local stdio execution, while Inbox Zero belongs to the Workplace & Productivity category with local stdio execution.

How do I install Caldav MCP or Inbox Zero 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 Caldav MCP and Inbox Zero free or paid?

Caldav MCP operates under a Free / Open Source model (API Key required). Inbox Zero operates under a Freemium model (OAuth 2.0).

Which MCP server has more tools and community activity?

Caldav MCP lists 8 tools with 2 views and 14 GitHub stars. Inbox Zero lists 6 tools with 1 views and 12,270 GitHub stars.

Can I use both Caldav MCP and Inbox Zero 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

Caldav MCP vs Inbox Zero

In-depth architectural comparison of the Caldav MCP and Inbox Zero 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

Caldav MCP

Workplace & Productivity · Local stdio

Quality: 55/100 (Good) | Auth: API Key required

Inbox Zero

Workplace & Productivity · Local stdio

Quality: 55/100 (Good) | Auth: OAuth 2.0

Verdict Summary: Choose Caldav MCP if you need specialized Workplace & Productivity tools running via a local process. Choose Inbox Zero if your workspace requires Workplace & Productivity integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose Caldav MCP when:

You need dedicated capabilities in the Workplace & Productivity domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: API Key required (Free / Open Source).
You have access to required keys: CALDAV_URL, CALDAV_USERNAME, CALDAV_PASSWORD.
Primary tools included: caldav_list_calendars, caldav_create_event, caldav_get_events.

Explore Caldav MCP Details

Choose Inbox Zero when:

You need dedicated capabilities in the Workplace & Productivity domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: OAuth 2.0 (Freemium).
You have access to required keys: GOOGLE_CLIENT_ID, GOOGLE_CLIENT_SECRET, MICROSOFT_CLIENT_ID, MICROSOFT_CLIENT_SECRET, GOOGLE_BASE_URL, MICROSOFT_BASE_URL.

Feature & Specification Comparison

Specification	Caldav MCP madbonez Workplace & Productivity	Inbox Zero elie222 Workplace & Productivity
Summary	Universal MCP server for CalDAV protocol integration. Works with any CalDAV-compatible calendar server including Yandex Calendar, Google Calendar (via CalDAV), Nextcloud, ownCloud, Apple iCloud, and others. Supports creating events with recurrence, categories, priority, attendees, reminders, searching events, and retrieving events by UID.	An MCP server for Inbox Zero. Adds functionality on top of Gmail like finding out which emails you need to reply to or need to follow up on.
Category & Scope

Tools & Capabilities Breakdown

Caldav MCP Tools (8)

caldav_list_calendars

List all available calendars

caldav_create_event

Create a new calendar event (supports recurrence, categories, priority, attendees)

caldav_get_events

Get events for a date range (returns extended fields: UID, categories, priority, attendees, recurrence)

caldav_get_today_events

Get events for today

caldav_get_week_events

Get events for the week

caldav_get_event_by_uid

Get a specific event by its UID

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).

Caldav MCP Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "madbonez-caldav-mcp": {
      "command": "uvx",
      "args": [
        "mcp-caldav"
      ],
      "env": {
        "CALDAV_URL": "YOUR_CALDAV_URL_HERE",
        "CALDAV_USERNAME": "YOUR_CALDAV_USERNAME_HERE",
        "CALDAV_PASSWORD": "YOUR_CALDAV_PASSWORD_HERE"
      }
    }
  }
}

Inbox Zero Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "elie222-inbox-zero": {
      "command": "npx",
      "args": [
        "-y",
        "@inbox-zero/cli"
      ],
      "env": {
        "GOOGLE_CLIENT_ID": "YOUR_GOOGLE_CLIENT_ID_HERE",
        "GOOGLE_CLIENT_SECRET": "YOUR_GOOGLE_CLIENT_SECRET_HERE",
        "MICROSOFT_CLIENT_ID": "YOUR_MICROSOFT_CLIENT_ID_HERE",
        "MICROSOFT_CLIENT_SECRET": "YOUR_MICROSOFT_CLIENT_SECRET_HERE",
        "GOOGLE_BASE_URL": "YOUR_GOOGLE_BASE_URL_HERE",
        "MICROSOFT_BASE_URL": "YOUR_MICROSOFT_BASE_URL_HERE"
      }
    }
  }
}

Frequently Asked Questions

Caldav MCP is categorized under Workplace & Productivity and uses a local stdio subprocess. In contrast, Inbox Zero belongs to Workplace & Productivity using local stdio subprocess. Select Caldav MCP when you need capabilities focused on workplace & productivity and Inbox Zero when you require tools for workplace & productivity.

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