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Tutanota

Tutanota is a free, open-source security and privacy app for Windows, macOS and Linux. Tuta is an email service with a strong focus on security and privacy that lets you encrypt emails, contacts and calendar entries on all your devices. It has 8,053 GitHub stars and is released under the GPL-3.0 license.

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

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About Tutanota

Tuta Mail is the secure email service with built-in end-to-end encryption that enables you to communicate securely with anyone on all your devices.

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FAQ

Tutanota FAQ

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Is Tutanota free and open source?

Yes. Tutanota's source code is public on GitHub under the GPL-3.0 license, which is OSI-approved or FSF-free, so you can use, copy and change it for free.

How do I install Tutanota?

Download the installer for Windows, macOS and Linux from its GitHub Releases page (latest: tutanota-desktop-release-362.261023.2) or the project website.

Is Tutanota still maintained?

The repository's most recent commit was on Oct 27, 2026. appsgit only lists apps whose repository had a commit in the last six months.