Outlook
Google Calendar
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
Proton Calendar
Service in Calendars
Calendar from Proton that encrypts event titles, notes, places and guests end to end.
Event times stay visible to Proton so reminders work.
Privacy passport
1 of 5 checks- No trackingMinimalOnly opt-in or anonymous first-party telemetry, such as crash reports.
- Open sourcePartlyThe apps are open source; the server or some parts are not.
- Only you can read itPartlySome of it is end-to-end encrypted, or encryption is opt-in.
- No accountNeededYou need an account to use it.
- FreeFree planA free plan, with paid upgrades.
Where it stands among 11 calendar apps
No tracking
Yes
Partly
Open source
Yes
Partly
Only you can read it
Yes
Partly
Not applicable
No account
Yes
No
Free
Yes
A private swap for
Other calendar apps
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