Kalender Sync icon
Kalender Sync icon

Kalender Sync

GDPR-compliant calendar sync tool that shares free/busy availability across Google, Outlook, iCloud, and more — without exposing event details.

Kalender Sync screenshot 1

Cost / License

  • Freemium (Subscription)
  • Proprietary

Platforms

  • Online
  • Software as a Service (SaaS)
Kalender Sync screenshot 1
Kalender Sync screenshot 2
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Kalender Sync screenshot 3
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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.  Calendar Sync

 Tags

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Kalender Sync information

  • Developed by

    DE flagpaul-kalender-sync

  • Licensing

    Proprietary and Freemium product.

  • Pricing

    Subscription ranging between $4 and $10 per month + free version with limited functionality.

  • Alternatives

    9 alternatives listed

  • Supported Languages

    • English
    • German
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 lets you synchronize calendar availability across different providers — Google Calendar, Microsoft Outlook/365, Apple iCloud, KSuite, and iCal feeds — without duplicating events or sharing sensitive details.

Instead of granting full access to your calendar, Kalender Sync only shares free/busy time blocks. You choose from three visibility levels: Busy Only (time slots only), Title & Time, or Full Details (never including attendees). This makes it ideal for teams, freelancers, and families who use different calendar providers and need to see each other's availability without compromising privacy.

Key highlights:

  • Works in the background with your existing calendars — no new app to learn
  • Three privacy levels: share as little or as much as you want
  • Supports Google Calendar, Microsoft Outlook/365, Apple iCloud, KSuite, and iCal feeds
  • Fully GDPR-compliant: hosted in Germany, data minimization by design, no tracking
  • Magic-link login — no passwords needed
  • GDPR Art. 17 account deletion and Art. 20 data export built in
  • Automatic sync via webhooks and polling — no manual maintenance

Built and hosted in Germany.

Official Links