📅 Calendar Privacy ★★★★★
Proton Calendar
End-to-end encrypted calendar
Overview
Proton Calendar encrypts event details client-side—Proton cannot read your schedule.
Part of Proton Mail/Drive/VPN ecosystem for staged Google Workspace exit.
Swiss-hosted with shared calendars and mobile apps expanding since 2024.
Scores
Privacy 5/5
Ease of use 4/5
Features 3/5
Value 4/5
Google Calendar — comparison
Unlike Google Calendar, events are E2EE—not fodder for ads or AI. No CalDAV yet.
Pros
- ✓ E2EE for event content (zero-access)
- ✓ Unified Proton ecosystem experience
- ✓ Strong Swiss privacy protections
- ✓ Clean web and mobile UI
Cons & caveats
- − Free tier limited (one calendar, 20 events)
- − No CalDAV—Proton apps required
- − Weaker external integrations than Google Calendar
Best for
- Proton Mail users
- E2EE priority
- First step leaving Google Workspace
Not ideal for
- CalDAV-native desktop workflows
- Large team shared calendars on free tier
Specs
- Pricing
- Free + paid — Free tier (one calendar, 20 events). Plus from €3.99/month for unlimited.
- Difficulty
- Easy
- Data location
- Switzerland (Proton AG); zero-access—servers hold ciphertext only.
- Platforms
- Web · Android · iOS
Zero-access暗号化Proton Mail統合共有カレンダー
Migration from Google Calendar
- 1 Export Google Calendar as .ics
- 2 Import .ics in Proton Calendar web
- 3 Link with Proton Mail account
- 4 Install mobile apps and configure notifications
Setup steps
- 1 Create Proton account at proton.me
- 2 Open Proton Calendar and complete setup
- 3 Import Google .ics export
- 4 Install Android/iOS app and verify sync