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title: Calendar Sync
description: Calendars contain some of your most sensitive data; use products that implement encryption at rest.
---
<small>Protects against the following threat(s):</small>
[{{< badge content="Passive Attacks" color="amber" >}}](../../../wiki/basics/common-threats.md#security-and-privacy)
[{{< badge content="Service Providers" color="indigo" >}}](../../../wiki/basics/common-threats.md#privacy-from-service-providers)
<div class="pg-card-logos">
{{< cards >}}
{{< card link="#tuta" title="Tuta" image="../email/tuta.svg" subtitle="Tuta offers a free and encrypted calendar across their supported platforms. Features include automatic E2EE of all data, sharing features, import/export functionality, multifactor authentication, and more." >}}
{{< card link="#proton-calendar" title="Proton Calendar" image="./proton-calendar.svg" subtitle="Proton Calendar is an encrypted calendar service available to Proton members via its web or mobile clients. Features include automatic E2EE of all data, sharing features, import/export functionality, and more." >}}
{{< /cards >}}
</div>
**Calendars** contain some of your most sensitive data; use products that implement end-to-end encryption at rest to prevent a provider from reading them.
## Tuta
<div class="admonition recommendation" markdown>
![Tuta logo](assets/img/email/tuta.svg#only-light){ align=right }
![Tuta logo](assets/img/email/tuta-dark.svg#only-dark){ align=right }
**Tuta** offers a free and encrypted calendar across their supported platforms. Features include automatic E2EE of all data, sharing features, import/export functionality, multifactor authentication, and [more](https://tuta.com/calendar-app-comparison).
Multiple calendars and extended sharing functionality are limited to paid subscribers.
[:octicons-home-16: Homepage](https://tuta.com/calendar){ .md-button .md-button--primary }
[:octicons-eye-16:](https://tuta.com/privacy){ .card-link title="Privacy Policy" }
[:octicons-info-16:](https://tuta.com/support){ .card-link title="Documentation" }
[:octicons-code-16:](https://github.com/tutao/tutanota){ .card-link title="Source Code" }
[:octicons-heart-16:](https://tuta.com/community#donate){ .card-link title="Contribute" }
{{< cards >}}
{{< card link="https://tuta.com/calendar" title="Homepage" icon="home" >}}
{{< card link="https://tuta.com/privacy" title="Privacy Policy" icon="eye" >}}
{{< /cards >}}
<details class="downloads" markdown>
<summary>Downloads</summary>
- [:simple-googleplay: Google Play](https://play.google.com/store/apps/details?id=de.tutao.calendar)
- [:simple-appstore: App Store](https://apps.apple.com/app/id6657977811)
- [:simple-github: GitHub](https://github.com/tutao/tutanota/releases?q=Calendar)
- [:fontawesome-brands-windows: Windows](https://tuta.com/blog/desktop-clients)
- [:simple-apple: macOS](https://tuta.com/blog/desktop-clients)
- [:simple-linux: Linux](https://tuta.com/blog/desktop-clients)
- [:simple-flathub: Flathub](https://flathub.org/apps/com.tutanota.Tutanota)
- [:octicons-browser-16: Web](https://app.tuta.com)
</details>
</div>
[{{< badge content="Linux" color="yellow" >}}](https://tuta.com/blog/desktop-clients)
[{{< badge content="macOS" color="indigo" >}}](https://tuta.com/blog/desktop-clients)
[{{< badge content="Windows" color="red" >}}](https://tuta.com/blog/desktop-clients)
[{{< badge content="Google Play" color="green" >}}](https://play.google.com/store/apps/details?id=de.tutao.calendar)
[{{< badge content="App Store" color="blue" >}}](https://apps.apple.com/app/id6657977811)
[{{< badge content="Flathub" >}}](https://flathub.org/apps/com.tutanota.Tutanota)
[{{< badge content="GitHub" >}}](https://github.com/tutao/tutanota/releases?q=Calendar)
[{{< badge content="Web" >}}](https://app.tuta.com)
## Proton Calendar
<div class="admonition recommendation" markdown>
![Proton](assets/img/calendar/proton-calendar.svg){ align=right }
**Proton Calendar** is an encrypted calendar service available to Proton members via its 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 have access to 3 calendars, whereas paid subscribers can create up to 25 calendars. Extended sharing functionality is also limited to paid subscribers.
[:octicons-home-16: Homepage](https://proton.me/calendar){ .md-button .md-button--primary }
[:octicons-eye-16:](https://proton.me/calendar/privacy-policy){ .card-link title="Privacy Policy" }
[:octicons-info-16:](https://proton.me/support/calendar){ .card-link title="Documentation" }
[:octicons-code-16:](https://github.com/orgs/ProtonMail/repositories?q=calendar){ .card-link title="Source Code" }
{{< cards >}}
{{< card link="https://proton.me/calendar" title="Homepage" icon="home" >}}
{{< card link="https://proton.me/calendar/privacy-policy" title="Privacy Policy" icon="eye" >}}
{{< /cards >}}
<details class="downloads" markdown>
<summary>Downloads</summary>
- [:simple-googleplay: Google Play](https://play.google.com/store/apps/details?id=me.proton.android.calendar)
- [:simple-appstore: App Store](https://apps.apple.com/app/id1514709943)
- [:octicons-browser-16: Web](https://calendar.proton.me)
</details>
</div>
[{{< badge content="Google Play" color="green" >}}](https://play.google.com/store/apps/details?id=me.proton.android.calendar)
[{{< badge content="App Store" color="blue" >}}](https://apps.apple.com/app/id1514709943)
[{{< badge content="Web" >}}](https://calendar.proton.me)
In 2021, Securitum [audited](https://proton.me/community/open-source#:~:text=Proton%20Calendar) Proton Calendar's web client and provided a [letter of attestation](https://res.cloudinary.com/dbulfrlrz/images/v1714639870/wp-pme/letter-of-attestation-proton-calendar-20211109_3138998f9b/letter-of-attestation-proton-calendar-20211109_3138998f9b.pdf) for the Android app.
## Criteria
**Please note we are not affiliated with any of the projects we recommend.** In addition to [our standard criteria](about/criteria.md), we have developed a clear set of requirements to allow us to provide objective recommendations. We suggest you familiarize yourself with this list before choosing to use a project, and conduct your own research to ensure it's the right choice for you.
**Please note we are not affiliated with any of the projects we recommend.** In addition to [our standard criteria](../../../about/criteria.md), we have developed a clear set of requirements to allow us to provide objective recommendations. We suggest you familiarize yourself with this list before choosing to use a project, and conduct your own research to ensure it's the right choice for you.
### Minimum Qualifications