privacyguides.org/docs/calendar-contacts.en.md

title	icon
Calendar and Contact Sync	material/calendar-account

Calendars and contacts contain some of your most sensitive data; use products that implement E2EE at rest to prevent a provider from reading them.

Tutanota

!!! recommendation

![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 }

**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.

[: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 }

??? downloads

    - [:simple-googleplay: Google Play](https://play.google.com/store/apps/details?id=de.tutao.tutanota)
    - [:simple-appstore: App Store](https://apps.apple.com/us/app/tutanota/id922429609)
    - [:simple-windows11: Windows](https://tutanota.com/blog/posts/desktop-clients/)
    - [:simple-apple: macOS](https://tutanota.com/blog/posts/desktop-clients/)
    - [:simple-linux: Linux](https://tutanota.com/blog/posts/desktop-clients/)
    - [:simple-flathub: Flathub](https://flathub.org/apps/details/com.tutanota.Tutanota)
    - [:octicons-browser-16: Web](https://mail.tutanota.com/)

Proton Calendar

!!! recommendation

![Proton](assets/img/calendar-contacts/proton-calendar.svg){ align=right }

**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.

**Proton Mail** can be used to synchronize contacts. Likewise, the service is currently only available via the web and mobile clients.

[: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" }

??? downloads

    - [:simple-googleplay: Google Play](https://play.google.com/store/apps/details?id=me.proton.android.calendar)
    - [:octicons-browser-16: Web](https://calendar.proton.me)

!!! warning Proton does not use E2EE for your contact names and email addresses.