Tuta

Tuta provides privacy-focused communication tools, including encrypted email, calendar, and contacts. Its service uses end-to-end encryption, post-quantum cryptography, and a zero-knowledge calendar to help individuals and organizations manage messages, events, and contact data with reduced tracking exposure.

Tuta supports personal and business use, including custom email domains, alias email addresses, mobile apps for Android and iPhone, desktop apps for Windows, macOS, and Linux, and browser access. The service is positioned for people, businesses, medical users, activists, and journalists who need private email and calendar management.

Operated by Tutao GmbH in Hanover, Germany, Tuta emphasizes GDPR-based privacy, open source clients, ad-free use, and renewable energy for powering emails, calendars, and contacts.