Review:

Proton Calendar

overall review score: 4.2
score is between 0 and 5
Proton Calendar is a secure, privacy-focused online calendar service developed by Proton AG, the creators of Proton Mail. It offers users a way to organize appointments, events, and scheduling tasks with end-to-end encryption, ensuring that personal data remains confidential and protected from third-party access.

Key Features

  • End-to-end encryption for all calendar data
  • Integration with Proton Mail and Proton VPN
  • Cross-platform support via web and mobile apps (iOS and Android)
  • Shared calendars with controlled access permissions
  • User-friendly interface with customizable event options
  • Secure data storage in Proton's privacy-centric infrastructure

Pros

  • Highly secure and privacy-oriented, safeguarding user data
  • Seamless integration within the Proton ecosystem enhances user experience
  • Accessible across devices with synchronization features
  • Supports collaboration through shared calendars with permission controls
  • Open source components promote transparency

Cons

  • Limited features compared to more established calendar services (e.g., Google Calendar)
  • Relatively new in the market, leading to fewer integrations with third-party apps
  • Some users may find the interface less intuitive initially
  • Lack of advanced features like AI-based scheduling or smart suggestions

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Last updated: Thu, May 7, 2026, 07:16:12 AM UTC