Kalender Sync icon
Kalender Sync icon

Kalender Sync

GDPR-compliant two-way calendar sync across Google, Outlook / Microsoft 365, iCloud, CalDAV and German providers like GMX. You choose per sync what is shared: busy only, title and time, or full details. Connects to Claude and ChatGPT via MCP. German company, German servers, DPA available.

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Cost / License

  • Freemium (Subscription)
  • Proprietary

Platforms

  • Online
  • Software as a Service (SaaS)
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Kalender Sync 2-way Sync
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Features

Properties

  1.  Privacy focused

Features

  1. Google Calendar icon  Sync with Google Calendar
  2.  GDPR Compliant
  3.  CalDAV Support
  4.  Sync with iCloud
  5.  Model Context Protocol (MCP) Support
  6.  Calendar Sync

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Kalender Sync was added to AlternativeTo by Paul Koch on and this page was last updated .

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What is Kalender Sync?

Kalender Sync keeps your calendars in sync across providers: Google Calendar, Microsoft Outlook / Microsoft 365, Apple iCloud, CalDAV providers like GMX, Web.de and Infomaniak kSuite, plus any iCal feed. One-way or two-way, without duplicating events across accounts by hand.

The core idea is privacy by design. For every sync you choose one of three visibility levels: Busy Only (just blocks the time), Title & Time, or Full Details. Attendees, attachments and links are never transferred at any level. That makes it ideal for freelancers, consultants and teams who use different calendar providers and need to see availability without exposing event details.

Key highlights:

  • Three visibility levels per sync: share as little or as much as you want
  • Two-way or one-way sync, configurable per connection
  • AI assistant integration via MCP: connect your calendars to Claude and ChatGPT to check availability and create or move events by chat
  • Real-time sync via webhooks for Google and Microsoft, regular polling for CalDAV
  • Optional source labels so you can see which calendar an event came from
  • Fully GDPR-compliant: German company, hosted at Hetzner in Germany, DPA available, account deletion and data export built in
  • Works in the background with your existing calendars, no new app to learn

Built and hosted in Germany.

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