---
title: "Tuta: Secure Private Calendar — App Overview"
url: https://marlvel.ai/intel-report/productivity/tuta-secure-private-calendar
category: Productivity
developer: Tutao GmbH
platforms: ios, android
rating: 4.4 (915 ratings)
pricing: free
report_level: overview
generated: 2026-04-18
last_verified: "2026-04-18T08:53:33.258Z"
---

<!-- SECTION: Key Insight -->
> **Key Insight:** While the app offers robust security features, users report significant technical stability issues, including frequent crashes and synchronization delays.

<!-- SECTION: Quick Facts -->
| Metric | Value |
|--------|-------|
| Category | Productivity |
| Rating | 4.4 ★ (915) |
| Pricing | free |
| Platforms | iOS, Android |
| Latest Version (iOS) | 340.260326.1 |
| Latest Version (Android) | 336.260316.0 |
| Developer | Tutao GmbH |

<!-- SECTION: Summary -->
## What is Tuta: Secure Private Calendar?

Tuta Calendar is a privacy-focused productivity tool that provides end-to-end, quantum-safe encryption for scheduling and event management. It is designed for users who prioritize data security and zero-knowledge architecture, offering seamless integration with the Tuta Mail app.

<!-- SECTION: Key Features -->
## Key Features

- **Quantum-Safe Encryption**: Ensures all event details and reminders are end-to-end encrypted and accessible only by the user.
- **Zero-Knowledge Architecture**: Maintains user privacy by ensuring the developer cannot access event times, meeting details, or attendee information.
- **Secure Event Sharing**: Allows users to share events with others or external calendars via password-protected invites.
- **Tuta Mail Integration**: Provides a unified experience by connecting the calendar directly with the Tuta Mail application.

<!-- SECTION: Target Audience -->
## Who is it for?

Privacy-conscious individuals seeking a secure, open-source alternative to mainstream calendar applications.

<!-- SECTION: Links -->
## Links

- [App Store](https://apps.apple.com/us/app/tuta-secure-private-calendar/id6657977811?uo=4)
- [Google Play](https://play.google.com/store/apps/details?id=de.tutao.calendar&hl=en&gl=us)
- [Full Intelligence Report](https://marlvel.ai/intel-report/productivity/tuta-secure-private-calendar)

---
*This is an overview report. Sentiment analysis, competitive landscape, and SWOT analysis are available in the [full intelligence report](https://marlvel.ai/intel-report/productivity/tuta-secure-private-calendar).*
*Generated by [Marlvel.ai](https://marlvel.ai) — Independent app intelligence.*