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---
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title: "Calendar and Contact Sync"
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icon: material/calendar
---
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Calendars and contacts contain some of your most sensitive data; use products that implement E2EE at rest to prevent a provider from reading them.
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## Tutanota
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!!! recommendation
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![Tutanota logo ](assets/img/calendar-contacts/tutanota.svg#only-light ){ align=right }
![Tutanota logo ](assets/img/calendar-contacts/tutanota-dark.svg#only-dark ){ align=right }
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**Tutanota** offers a free and encrypted calendar across their supported platforms. Features include: automatic E2EE of all data, sharing features, import/export functionality, multi-factor authentication, and [more ](https://tutanota.com/calendar-app-comparison/ ).
Multiple calendars and extended sharing functionality is limited to paid subscribers.
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[:octicons-home-16: Homepage ](https://tutanota.com/calendar ){ .md-button .md-button--primary }
[:octicons-eye-16: ](https://tutanota.com/privacy ){ .card-link title="Privacy Policy" }
[:octicons-info-16: ](https://tutanota.com/faq ){ .card-link title=Documentation}
[:octicons-code-16: ](https://github.com/tutao/tutanota ){ .card-link title="Source Code" }
[:octicons-heart-16: ](https://tutanota.com/community/ ){ .card-link title=Contribute }
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??? downloads
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- [:octicons-browser-16: Web ](https://mail.tutanota.com/ )
- [:fontawesome-brands-windows: Windows ](https://tutanota.com/blog/posts/desktop-clients/ )
- [:fontawesome-brands-apple: macOS ](https://tutanota.com/blog/posts/desktop-clients/ )
- [:fontawesome-brands-linux: Linux ](https://tutanota.com/blog/posts/desktop-clients/ )
- [:pg-flathub: Flatpak ](https://flathub.org/apps/details/com.tutanota.Tutanota )
- [:fontawesome-brands-google-play: Google Play ](https://play.google.com/store/apps/details?id=de.tutao.tutanota )
- [:pg-f-droid: F-Droid ](https://f-droid.org/en/packages/de.tutao.tutanota )
- [:fontawesome-brands-app-store-ios: App Store ](https://apps.apple.com/us/app/tutanota/id922429609 )
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## EteSync
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!!! recommendation
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![EteSync logo ](assets/img/calendar-contacts/etesync.svg ){ align=right }
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**EteSync** is a secure, end-to-end encrypted, and privacy-respecting cloud backup and synchronization software for your personal information, including contacts and calendars. There are native clients for Android, iOS, with a web client and an adapter layer for most desktop clients available too. Etesync does [not ](https://www.etesync.com/faq/#2fa ) currently support multi-factor authentication.
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EteSync offers a SaaS for [$24/year ](https://dashboard.etebase.com/user/partner/pricing/ ), or you can host the server yourself for free.
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[:octicons-home-16: Homepage ](https://www.etesync.com ){ .md-button .md-button--primary }
[:octicons-eye-16: ](https://www.etesync.com/tos/#privacy ){ .card-link title="Privacy Policy" }
[:octicons-info-16: ](https://www.etesync.com/user-guide/ ){ .card-link title=Documentation}
[:octicons-code-16: ](https://github.com/etesync ){ .card-link title="Source Code" }
[:octicons-heart-16: ](https://www.etesync.com/contribute/ ){ .card-link title=Contribute }
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??? downloads
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- [:octicons-device-desktop-16: Client Setup ](https://github.com/etesync/etesync-dav/blob/master/README.md#specific-client-notes-and-instructions )
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- [:fontawesome-brands-google-play: Google Play ](https://play.google.com/store/apps/details?id=com.etesync.syncadapter )
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- [:pg-f-droid: F-Droid ](https://f-droid.org/app/com.etesync.syncadapter )
- [:fontawesome-brands-app-store-ios: App Store ](https://apps.apple.com/us/app/apple-store/id1489574285 )
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- [:fontawesome-brands-docker: Docker Hub ](https://hub.docker.com/r/victorrds/etesync )
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## Proton Calendar
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!!! recommendation
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![Proton ](assets/img/calendar-contacts/proton-calendar.svg ){ align=right }
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**Proton Calendar** is an encrypted calendar service available to Proton members via web or mobile clients. Features include: automatic E2EE of all data, sharing features, import/export functionality, and [more ](https://proton.me/support/proton-calendar-guide ). Those on the free tier get access to a single calendar, whereas paid subscribers can create up to 20 calendars. Extended sharing functionality is also limited to paid subscribers.
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**Proton Mail** can be used to synchronize contacts. Likewise, the service is currently only available via the web and mobile clients.
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[:octicons-home-16: Homepage ](https://proton.me/calendar ){ .md-button .md-button--primary }
[:octicons-eye-16: ](https://proton.me/legal/privacy ){ .card-link title="Privacy Policy" }
[:octicons-info-16: ](https://proton.me/support/proton-calendar-guide ){ .card-link title=Documentation}
[:octicons-code-16: ](https://github.com/ProtonMail/WebClients ){ .card-link title="Source Code" }
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??? downloads
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- [:octicons-browser-16: Web ](https://calendar.proton.me )
- [:fontawesome-brands-google-play: Google Play ](https://play.google.com/store/apps/details?id=me.proton.android.calendar )
!!! warning
Proton [does not ](https://proton.me/support/proton-contacts#verify ) use E2EE for your contact names and email addresses.
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--8< -- " includes / abbreviations . en . md "