Tuta encrypts the whole calendar, event titles, times, attendees, and notes so the provider cannot read your schedule. It comes with the encrypted Tuta mail account and runs through Tuta’s own apps on every platform. The trade is no CalDAV: the encryption rules out standard sync so you stay inside Tuta’s apps, reaching other software only through a Thunderbird add-on plus .ics import and export. Pick it if you want mail and calendar locked down together and are fine staying in one ecosystem.
Tuta Calendar
Fully encrypted calendar tied to Tuta's own apps.
tuta.com
FreemiumOpen SourceE2E EncryptedWindowsmacOSLinuxAndroidiOSWebGermany
Pricing Free plan with 1 GB and full encryption; paid from around €3/mo for more storage and calendars.
Strengths
- Every event field is end-to-end encrypted
- Comes with the encrypted Tuta mail account
- Open source, with apps on every platform
Considerations
- No CalDAV so no standard sync
- Locked to Tuta's own apps
Listed in Calendars
