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Best European alternatives to Proton Calendar in 2026

We found 1 EU-built alternative to Proton Calendar — GDPR-native, with verified data sovereignty and transparent rankings. No pay-to-win.

1 EU-built alternative to Proton Calendar

Tuta Calendar

Scheduling

EU Based

Tuta 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.

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