Über 10 Millionen Nutzer vertrauen Tuta für verschlüsselte Kommunikation. In Hannover, Deutschland, entwickelt, vereint der Dienst E-Mail, Kalender und Kontakte unter einem Dach – alles Ende-zu-Ende-verschlüsselt. Gestartet nach Snowden-Enthüllungen, priorisiert Tuta Privacy ohne Werbung oder Tracking. Server mit erneuerbarer Energie, Clients Web/Mobile/Desktop. Gratis: 1 GB; Paid bis 500 GB mit eigenen Domains und Aliasen.
Tuta
German end-to-end encrypted email, calendar, and contacts from Tutao GmbH in Hanover—with post-quantum TutaCrypt, open-source clients, and freemium personal plus business plans.
Open Source
This entry was drafted from publicly available information and still needs human review before treating it as final due-diligence guidance.
Key capabilities
Tuta encrypts emails automatically between users, covering subjects, bodies, and attachments. External recipients get password-protected links. Contacts and calendars receive the same treatment, ensuring only sender and recipient access data. This zero-knowledge setup means Tuta cannot read user content.
TutaCrypt protects against future quantum computer threats. The protocol combines Kyber-1024 for key exchange, X25519, and AES-256. New accounts use it now; older ones follow soon. This forward-thinking approach sets Tuta apart in long-term security.
Native clients run on web, Android (Google Play and F-Droid), iOS, Windows, macOS, and Linux. A unified app handles email, calendar, and contacts. Features include unlimited search via encrypted indexes (premium), 25 MB attachments, HTML signatures, and offline support. Standalone calendar launched in 2024.
Häufig gestellte Fragen
Yes, a free plan includes 1 GB storage, one calendar, and three labels. Revolutionary (€3/month yearly) adds 20 GB, unlimited calendars/labels, 15 aliases, and three custom domains. Legend (€8/month) scales to 500 GB, 30 aliases, and 10 domains. Business plans start separate.
Yes, as a German service, Tuta adheres to GDPR. Data stays in Germany, with zero-knowledge encryption preventing even server access to content. Servers meet ISO 27001 standards.
Proton Mail offers strong encryption from Switzerland but lags on quantum upgrades. Mailbox.org provides broader tools like cloud storage in Germany, with optional E2EE. Posteo focuses on ad-free, green email in Germany but without full subject encryption.