What is Tuta used for?

Tuta Mail is an encrypted email, contacts and calendar service with open-source clients for web, desktop and mobile devices, focused on privacy. It is a good fit for private email for individuals, and encrypted calendar and contacts across devices.

Yes. Tuta is open source under the GPL-3.0 licence. Its source code is on GitHub at tutao/tutanota and is written mainly in TypeScript.

Yes. Tuta is open source, so the software itself is free to use. A managed cloud version is also available.

What is Tuta an alternative to?

Tuta is an open-source alternative to Gmail, Proton Mail, Microsoft Outlook and HEY. Other open-source alternatives to Gmail include Forward Email, Mailcow and Mailu.

Is Tuta actively maintained?

Yes. The most recent commit to Tuta was on 2 October 2026. The project has 8k stars on GitHub.

Tuta: open-source alternative to Gmail, Proton Mail

About Tuta

Tuta, formerly known as Tutanota, is an email service built around security and privacy. It uses built-in end-to-end encryption to protect emails, contacts and calendar entries across devices, and it lets users communicate securely with other people regardless of what provider they use.

The open-source repository contains the client applications, which include a web client, an iOS app and a desktop client, along with separate calendar releases for mobile platforms. The code is written in TypeScript and JavaScript on top of the Mithril framework and is licensed under GPL-3.0. Build, translation and development instructions are provided in dedicated files, and the roadmap and feature requests are handled through Reddit and the vendor website.

Tuta is a hosted service operated by the vendor rather than a product you install on your own server. The repository states that it does not accept contributions or bug reports produced with the help of large language models, and maintainers close such submissions without explanation.

Key features

End-to-end encrypted email
Encrypted contacts and calendar entries
Web, desktop and iOS clients
Open-source client code
Community translations

Good fit for

→Private email for individuals
→Encrypted calendar and contacts across devices

Built with: TypeScript; JavaScript
Tags: email; encryption; privacy; calendar; contacts; e2ee; security; typescript

Tuta: questions and answers

What is Tuta used for?: Tuta Mail is an encrypted email, contacts and calendar service with open-source clients for web, desktop and mobile devices, focused on privacy. It is a good fit for private email for individuals, and encrypted calendar and contacts across devices.
Is Tuta open source?: Yes. Tuta is open source under the GPL-3.0 licence. Its source code is on GitHub at tutao/tutanota and is written mainly in TypeScript.
Is Tuta free?: Yes. Tuta is open source, so the software itself is free to use. A managed cloud version is also available.
What is Tuta an alternative to?: Tuta is an open-source alternative to Gmail, Proton Mail, Microsoft Outlook and HEY. Other open-source alternatives to Gmail include Forward Email, Mailcow and Mailu.
Is Tuta actively maintained?: Yes. The most recent commit to Tuta was on 2 October 2026. The project has 8k stars on GitHub.