Tuta
End-to-end encrypted email, calendar, and contacts with quantum-resistant encryption. Free, ad-free, and designed for privacy-conscious users.
Tuta is an open-source alternative to:

Tuta is a privacy-first email service that provides secure communication through end-to-end encryption, ensuring your data remains private and protected. Built with quantum-resistant encryption, Tuta offers a seamless experience for email, calendar, and contacts management without ads or tracking.
Key Features
- Quantum-resistant encryption for maximum data protection
- End-to-end encrypted email with intuitive design for fast workflows
- Zero-knowledge calendar that respects your privacy
- Ad-free and tracking-free interface
- Cross-platform support with apps for Android, iPhone, and web
- Custom domain support for professional email addresses
- Push notifications for calendar events on all devices
- Open-source with transparent security practices
Tech / Self-Hosting
Tuta is open-source and available as a self-hosted solution. The project is developed in TypeScript and can be deployed on your own infrastructure for full control over your data. Visit the GitHub repository for deployment instructions and technical details.