PrivacyTools.io
Reviewed by Marcus Holmberg
Replace today: 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.

Grouped by threat level

Covered Easy start and good defaults for everyone
Hardened Some setup and real gains for the willing

How they compare

Tool Hosting Based in Cost
Proton Calendar 		Provider Switzerland Freemium
Tuta 		Provider Germany Freemium
EteSync 		Self-host · Freemium
Radicale 		Self-host France ·
Peergos 		Self-host United Kingdom Free

Your calendar is a map of your life: who you meet and where you go, hour by hour. Most calendar apps keep that map readable on their servers, feeding the same profile as the rest of your account. An encrypted calendar keeps it to yourself, syncing across your devices while the provider stores only data it cannot read. Several here use the open CalDAV standard or can be self-hosted, so your schedule stays portable. These are the ones worth trusting with your week.

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, because the readable copy is what powers the reminders and the smart suggestions across your account. An encrypted calendar like Proton Calendar fixes it at the root by encrypting the event details on your device, so even the company hosting it holds entries it cannot open and learns nothing about your week.

How we pick

Every calendar here is measured against our public listing criteria. For this category that means end-to-end encryption of the event details themselves rather than just the connection, plus support for an open standard so the calendar is not a walled garden and a clean export so your events are never trapped. We weigh jurisdiction as one factor rather than a hard gate, and we list only a calendar we would put our own schedule in. Some picks are self-hostable for anyone who wants to remove the provider entirely.

What to look for in an encrypted calendar

Start with real end-to-end encryption of the event details, not just an HTTPS connection, so the provider holds entries it cannot read. Then check for support for the open CalDAV standard, since that is what lets the calendar work inside the apps already on your phone and laptop instead of locking you into a web page. A self-hostable option like Radicale goes further by keeping the data on your own server. Round it out with invitations anyone can accept and a plain ICS export, so your events stay portable. The shared point is that the only readable copy of your schedule stays with you.

Are encrypted calendars as convenient as the default?

For the daily routine, yes. Events, recurring entries, reminders, and invitations all work, and CalDAV means the calendar shows up in the apps you already use. The honest catch is at the edges: because the provider cannot read your events, some of the slick suggestions and the instant cross-service sharing of a big provider are traded away, and a few of the most polished features sit behind a paid plan. Most people find the trade easy, since the thing they give up is convenience features built on the provider reading their schedule in the first place. Our Google Calendar alternatives page compares the moves.

How to switch

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. If you are leaving Google more broadly, the de-Google playbook covers the rest of the ecosystem, and pairing the calendar with private email keeps your invitations out of a profile too.

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 your phone and your 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.
What part of my calendar does the encryption actually hide?
On a properly end-to-end encrypted calendar, the event details themselves are hidden from the provider: the title, the time, the location, and the notes. That goes well beyond an HTTPS connection, which only protects data in transit and still leaves the events readable once they land on the server. The point is that the company holds entries it cannot open.
Does an encrypted calendar break shared or family calendars?
Sharing still works, but it is handled a little differently, because the calendar has to pass the decryption key to the people you share with rather than simply reading the events on a server. Within the same service this is usually seamless. Sharing a fully encrypted calendar out to someone on a mainstream service is where the slick, instant sharing of a big provider is traded away.
Is a self-hosted calendar more private than a hosted one?
It can be, because a calendar you run on your own server means the events never touch anyone else's infrastructure at all. The cost is that you take on the setup and the ongoing upkeep yourself. A hosted encrypted calendar is far easier to live with and still keeps the provider from reading your events, so the better choice depends on how much you want to manage.