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Storage & NotesIntermediate20 minall

Private Calendar

Risk

The risk

Why this matters

Google Calendar knows your doctor appointments, therapy sessions, AA meetings, and custody schedules. Calendar metadata reveals health conditions, relationships, routines, and vulnerabilities — often more sensitive than email content.

Recommended tools

What to use

Proton Calendar
Proton CalendarOSSFree

E2E encrypted calendar integrated with Proton Mail. Swiss.

Tuta Calendar
Tuta CalendarOSSFree

E2E encrypted calendar included with Tuta Mail. German.

EteSync
EteSyncOSS

E2E encrypted calendar/contacts sync. Self-hostable. Open-source.

Nextcloud Calendar
Nextcloud CalendarOSSFree

Calendar app for Nextcloud. Self-hosted, CalDAV compatible.

Setup guide

How to set it up

  1. 1

    If you already use Proton Mail: enable Proton Calendar (built-in)

  2. 2

    Export your Google Calendar data (Settings → Import & Export → Export)

  3. 3

    Import into your encrypted calendar provider

  4. 4

    Disable Google Calendar sync on your devices