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Calendar

Proton Calendar

Privacy-oriented calendar to reduce

and improve data control.

Privacy score 74 Free Technical: Beginner Featured
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Privacy-oriented calendar designed to reduce

compared to mainstream options.

Web Android iOS

Who is this for?

✓ Good for you if:

  • • You want fewer trackers and less account-linked data
  • • You care about privacy by default

⚠ Think twice if:

  • • You need the broadest third-party calendar integrations, plugins, or enterprise scheduling controls
  • • You collaborate heavily with users whose workflows depend on Google or Microsoft-specific features
  • • You require every event field and notification to be end-to-end encrypted in all sharing scenarios

Key qualities

✓ Encryption ✓ Low telemetry

Overview

Proton Calendar is a calendar commonly used as a more privacy-respecting alternative to mainstream services.

Privacy notes:
- Aims to reduce tracking

, limit unnecessary data collection, and/or support stronger encryption.
- Your privacy still depends on your settings, device security, and (for hosted services) the operator.

Practical tip:
- Combine privacy-friendly software with strong passwords, 2FA, and regular updates for best results.

Privacy highlight

More privacy-oriented than mainstream.

Quick facts

Country:
🇨🇭 Switzerland
Pricing:
Free
Platform:
Web, Android, iOS
Technical:
Beginner
:
Unknown
:
No
Open-source status:
Closed source
:
No
:
Yes

Key features

  • Events & reminders
  • Sharing (varies)
  • Import/export (ICS)
  • Multiple calendars
  • Sync across devices (varies)
Security & encryption Click to expand
Unknown
Encryption protocols
Encryption at rest (provider/self-host dependent), TLS in transit
Designed to protect core content with client-side ; details vary by feature and settings.
Offline support
No
Telemetry & tracking Click to expand
Not specified
No
and details will be provided in the full review.
Jurisdiction & compliance Click to expand
Primarily Switzerland and/or EU data centers (service-dependent).
policies will be detailed in the full review.
Legal frameworks
Swiss FADP
Revenue sources
paid subscriptions
Editorial signals Click to expand
74
Trust score
62
Trust breakdown (0–10)
Encryption: 70, Audits: 50, Open source: 45, Telemetry: 80, Jurisdiction: 85, Transparency: 50, Trackers: 90
Editorial notes
Usability: 75, Performance: 80, Family friendly: 80
User experience Click to expand
Signup requirements
email
Onboarding difficulty (1-5)
3
Accessibility features
Support for modern accessibility features depends on the platform version.
Backup & portability Click to expand
Yes
Migration tools
May offer import or export tools; see official docs.
Account recovery options (varies by settings), Recovery phrase or recovery file (if enabled)

Similar privacy apps

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Google Calendar

Score 40

Mainstream calendar from Google, tightly integrated with Google accounts and services.

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Etar Calendar

Score 76

Privacy-friendly calendar you can use without creating an account.

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Tuta Calendar

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Privacy-oriented calendar designed to reduce tracking compared to mainstream options.

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