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Tuta Calendar

Tuta Calendar is a free, open-source calendar and contacts app for Android and iOS. Quantum-safe encrypted planner to schedule & manage your events & sync calendars. It has 8,053 GitHub stars and is released under the GPL-3.0-or-later license, and you can install it from F-Droid, Google Play and the App Store.

github.com/tutao/tutanota (opens in a new tab)

Data as of from the GitHub API and the F-Droid index; description from the project's repository or F-Droid listing. Report an error

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About Tuta Calendar

Take your privacy to the next level with the secure Tuta Calendar app. This encrypted time-management tool is the most private way to organize your busy schedule – and it’s quick to navigate, comes with dark and light mode, plus, it’s perfectly integrated with the Tuta Mail app. SECURE CALENDAR * Quantum-safe encryption: End-to-end encrypted data exchange with all Tuta Calendar users and with users of other calendar apps (via optional password-protected event invites). * No ads, no tracking, and no data sharing: We protect your privacy. * Zero-knowledge architecture: Entire events, including event notifications, are encrypted and hidden from our servers.

Privacy and F-Droid

F-Droid builds Tuta Calendar from its published source code and flags anti-features such as ads, tracking or reliance on non-free services.

  • Relies on a non-free network service

Screenshots

  • Tuta Calendar screenshot 1
  • Tuta Calendar screenshot 2
  • Tuta Calendar screenshot 3

Screenshots from the app's F-Droid listing.

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FAQ

Tuta Calendar FAQ

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Is Tuta Calendar free and open source?

Yes. Tuta Calendar's source code is public on GitHub under the GPL-3.0-or-later license, which is OSI-approved or FSF-free. F-Droid flags these anti-features on its latest build: relies on a non-free network service.

How do I install Tuta Calendar?

You can install Tuta Calendar from F-Droid (package de.tutao.calendar), from Google Play and from the App Store; the links are on this page. Its GitHub repository also publishes releases (latest: tutanota-desktop-release-362.261023.2).

Is Tuta Calendar still maintained?

The repository's most recent commit was on Oct 27, 2026. Its F-Droid listing was last updated on Sep 26, 2026. appsgit only lists apps whose repository had a commit in the last six months.