privacyapps.ioPrivacy checkup

Private calendar apps

11 apps, each with a privacy passport

A calendar shows where you'll be, when and with whom. Encrypted calendars hide event details from the provider, though some still see the times. Offline Android calendars keep events on your phone and can sync to a server you pick.

Leaving one of these?

If you only try two

Privacy passport
Proton Calendar
Calendars
Our pick
No tracking
Minimal
Open source
Partly
Only you can read it
Partly
No account
Needed
Free
Free plan
1 of 5 checks
- Android
- iPhone
- Web
Easy switch, works with Proton Mail
Privacy passport
Tuta Calendar
Calendars
Our pick
No tracking
Yes
Open source
Yes
Only you can read it
Encrypted
No account
Needed
Free
Free plan
4 of 5 checks
- Android
- iPhone
- Mac
- Windows
- Linux
- Web
Encrypts all event details, free plan

All 11 calendar apps

Passes

Works on

11 of 11 apps

Proton CalendarPick

Service

Calendar from Proton that encrypts event titles, notes, places and guests end to end.

Minimal tracking
Partly open
Partly encrypted
Account needed
Free plan

Android
iPhone
Web

Tuta CalendarPick

Service8k

German calendar app that encrypts every event detail, times included, with a free plan.

No tracking
Open source
End-to-end encrypted
Account needed
Free plan

Android
iPhone
Mac
Windows
Linux
Web

Nextcloud

Self-hosted37.3k

Run your own cloud for files, calendars, notes and forms on a server you control, with apps for every device.

No tracking
Open source
On your server
Account needed
Free

Android
iPhone
Mac
Windows
Linux
Web

DAVx⁵

App3k

Syncs your Android calendars, contacts and tasks with any CalDAV or CardDAV server you choose.

No tracking
Open source
No account
Free plan

Android

Etar

App2.6k

Open-source Android calendar with a clean month and agenda view that works with any synced account.

No tracking
Open source
Stays on device
No account
Free

Android

Fossify Calendar

App2.3k

Offline Android calendar with widgets, CalDAV support and no internet permission.

No tracking
Open source
Stays on device
No account
Free

Android

KashCal

App461

Offline-first Android calendar that syncs with iCloud or CalDAV and searches all your events.

No tracking
Open source
Stays on device
No account
Free

Android

Radicale

Self-hosted5.1k

Small CalDAV and CardDAV server for hosting your own calendars and contacts on a home machine.

No tracking
Open source
On your server
Account needed
Free

Mac
Windows
Linux

Baïkal

Self-hosted3.4k

Lightweight calendar and contacts server you run yourself, managed through a simple web admin.

No tracking
Open source
On your server
Account needed
Free

Web

Tuta

Service8k

German email and calendar that encrypt the whole mailbox, including subject lines and contacts.

No tracking
Partly open
End-to-end encrypted
Account needed
Free plan

Android
iPhone
Mac
Windows
Linux
Web

Thunderbird

App

Free desktop and Android mail app from the Mozilla family that works with any provider and supports OpenPGP.

Minimal tracking
Open source
Stays on device
No account
Free

Android
Mac
Windows
Linux

What to check in calendar apps

1 Which event details are end-to-end encrypted
2 Syncs with standard CalDAV so you can switch later
3 Can share events and invite people outside the app

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