Bitcoin Calendars

#1

Ad · Select the "Mail Plus" or "Proton Unlimited" paid plans for more features.

#2

Tuta: Free, Cross-Platform and Zero-Knowledge Calendar

#3

If you decide to self-host EteSync you won't have to pay for the subscription. Tutorial here .

#4

End-to-end encrypted sync for calendars, contacts, and tasks, wired into the apps you already use over CalDAV.

#5

Audited by Cure53 in May 2019.