Proton Calendar is a privacy-first calendar with end-to-end encryption, ensuring that only you can access your events. Developed by the creators of Proton Mail and based in Switzerland.
Tuta Calendar offers end-to-end encrypted scheduling with a strict no-tracking policy. All calendar data remains encrypted, including event titles and notifications.
Mailfence Calendar is part of a secure email and productivity suite based in Belgium. It supports encryption, digital signatures, and privacy-friendly collaboration.
Nextcloud Calendar is a self-hosted calendar solution that integrates with encrypted file storage and collaboration tools. Ideal for users who want full control over their data.
EteSync provides end-to-end encrypted synchronization for calendars, contacts, and tasks. It works with existing calendar apps while keeping all metadata private.
Skiff Calendar was an end-to-end encrypted calendar service focused on privacy and collaboration. The project has been discontinued, but it influenced modern encrypted productivity tools.
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