Proton Calendar
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Google Calendar Outlook Calendar iCloud Calendar
Encrypted Calendars: Secure Your Schedule and Privacy Today
Private alternatives to Google Calendar, Outlook Calendar, iCloud Calendar, vetted against our public criteria.
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Tuta
Tuta: Free, Cross-Platform and Zero-Knowledge Calendar
EteSync
If you decide to self-host EteSync you won't have to pay for the subscription. Tutorial here .
Radicale
A simple self-hosted CalDAV and CardDAV server for calendars and contacts, written in Python and licensed under GPLv3.
Peergos
Audited by Cure53 in May 2019.
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Your calendar is a map of your life: who you meet, where you go, and when you sleep. An encrypted calendar keeps that map to yourself, syncing across your devices while the provider stores only data it cannot read. These are the ones worth trusting with your week.
What to look for in an encrypted calendar
End-to-end encryption of the event details themselves, not just an HTTPS connection, so the provider holds entries it cannot read. Support for the open CalDAV standard so the calendar works with the apps already on your phone and laptop rather than locking you into a web page. Clean invitations that anyone can accept, and a plain export so your events are never trapped in one service.
Why a “private” Google Calendar is not enough
Google Calendar can hide an event from other people, but never from Google: the entries sit readable on its servers, feeding the same profile as the rest of your account. That is a property of the design, not a setting you can switch off. An encrypted calendar fixes it at the root by keeping the only readable copy on your own devices, so even the company hosting it learns nothing about your week.
Switching without losing anything
Export your current calendar as an ICS file, import it into the new one, then connect the account over CalDAV on every device so it stays in sync. Run the old and new calendars side by side for a couple of weeks to catch any recurring events that did not transfer cleanly before you switch the old one off.
Frequently asked
- Can I import my existing events?
- Yes. Export your current calendar as an ICS file and import it into the new one. Recurring events and reminders carry over, though it is worth double-checking anything with an unusual repeat rule.
- Will it sync with my phone's calendar app?
- Most of these use CalDAV, the open calendar standard, so they sync with the built-in calendar on iPhone, Android, and desktop. You are not stuck inside one company's app.
- Can I still invite people who do not use it?
- Yes. Invitations go out as standard calendar messages that any calendar can read and respond to, so the people you schedule with never need to switch anything.