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Kalender Sync

Kalender Sync

AI

GDPR-compliant calendar sync that links Outlook, Google, iCloud and more, and lets Claude, ChatGPT or other agents manage your calendars via MCP.

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Free Available
Starting from Free
Premium plans available
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About Kalender Sync

Kalender Sync is a German calendar synchronization service that connects Outlook, Google, Apple iCloud, GMX, WEB.DE, mailbox.org, kSuite, Posteo and STRATO calendars in real time, either one-way or two-way. For every sync you choose how much is visible to the other side: busy only, title and time, or full details, which makes it practical for separating work and private calendars or sharing availability with clients. It also exposes your calendars to AI assistants through a remote MCP server, so Claude, Claude Code, ChatGPT, Codex, Cursor, Grok or OpenClaw can find free time across all calendars, create or edit events and even set up syncs on request. Access is granted per calendar with optional write permission and an access log. The service is hosted in Germany and advertises full GDPR compliance, with a free tier and paid plans from 5 euros per month.

Screenshots

Kalender Sync screenshot 1
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Key Features

Multi-Provider Calendar Sync: Connects Outlook, Google, Apple iCloud, GMX, WEB.DE, mailbox.org, kSuite, Posteo and STRATO calendars in real time, one-way or two-way.
Visibility Levels: Choose per sync whether the target sees busy only, title and time, or full event details.
AI Assistant Access via MCP: Remote MCP server lets Claude, ChatGPT, Codex, Cursor, Grok and OpenClaw read and manage your calendars.
Agent-Driven Setup: Ask your connected AI agent to create syncs, find free time across calendars and schedule events.
Per-Calendar Permissions: Grant AI access calendar by calendar, with optional write access and an access log.
Calendar Sharing: Share a calendar with another person without exposing the underlying account.
Credit-Based AI Usage: Monthly AI credits cover event searches, availability checks and event edits, with optional top-ups.
GDPR Compliance: Hosted in Germany with data-protection-focused design.

Use Cases

A freelancer mirrors client calendars into one personal calendar while hiding event details behind busy blocks.
A manager with several roles keeps Outlook, Google and iCloud calendars synchronized to avoid double bookings.
A tax advisor lets Claude find free slots across work and private calendars and book appointments.
A coach shares availability with clients without giving access to the full calendar.
A developer connects Claude Code or Cursor to their calendar through MCP to plan the week.
An interim manager with multiple companies consolidates every company calendar into a single view.

Frequently asked questions about Kalender Sync

What is Kalender Sync?

GDPR-compliant calendar sync that links Outlook, Google, iCloud and more, and lets Claude, ChatGPT or other agents manage your calendars via MCP.

How does Kalender Sync work?

Kalender Sync works by combining Multi-Provider Calendar Sync: Connects Outlook, Google, Apple iCloud, GMX, WEB.DE, mailbox.org, kSuite, Posteo and STRATO calendars in real time, one-way or two-way., Visibility Levels: Choose per sync whether the target sees busy only, title and time, or full event details., AI Assistant Access via MCP: Remote MCP server lets Claude, ChatGPT, Codex, Cursor, Grok and OpenClaw read and manage your calendars., Agent-Driven Setup: Ask your connected AI agent to create syncs, find free time across calendars and schedule events., Per-Calendar Permissions: Grant AI access calendar by calendar, with optional write access and an access log. to help users with A freelancer mirrors client calendars into one personal calendar while hiding event details behind busy blocks., A manager with several roles keeps Outlook, Google and iCloud calendars synchronized to avoid double bookings., A tax advisor lets Claude find free slots across work and private calendars and book appointments., A coach shares availability with clients without giving access to the full calendar., A developer connects Claude Code or Cursor to their calendar through MCP to plan the week..

What are the main features of Kalender Sync?

Key features include Multi-Provider Calendar Sync: Connects Outlook, Google, Apple iCloud, GMX, WEB.DE, mailbox.org, kSuite, Posteo and STRATO calendars in real time, one-way or two-way., Visibility Levels: Choose per sync whether the target sees busy only, title and time, or full event details., AI Assistant Access via MCP: Remote MCP server lets Claude, ChatGPT, Codex, Cursor, Grok and OpenClaw read and manage your calendars., Agent-Driven Setup: Ask your connected AI agent to create syncs, find free time across calendars and schedule events., Per-Calendar Permissions: Grant AI access calendar by calendar, with optional write access and an access log..

Who is Kalender Sync for?

Kalender Sync is useful for anyone interested in A freelancer mirrors client calendars into one personal calendar while hiding event details behind busy blocks., A manager with several roles keeps Outlook, Google and iCloud calendars synchronized to avoid double bookings., A tax advisor lets Claude find free slots across work and private calendars and book appointments., A coach shares availability with clients without giving access to the full calendar., A developer connects Claude Code or Cursor to their calendar through MCP to plan the week..

How much does Kalender Sync cost?

Kalender Sync offers a free tier with paid plans for advanced features.

How do I get started with Kalender Sync?

Visit https://kalender-sync.de/en/ to sign up and explore Kalender Sync.

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