2 EU-built alternatives to Proton Calendar
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Tuta Calendar
SchedulingTuta Calendar is a privacy-focused encrypted calendar integrated with the Tuta secure email service. It offers end-to-end encryption for all events and data, ensuring no third party can access your schedule.
DE
Nextcloud Calendar
SchedulingNextcloud Calendar is an open-source CalDAV-based calendar app integrated into the Nextcloud platform. It allows users to manage personal and shared calendars, schedule events, and sync across devices while keeping data self-hosted.
DE
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