Mobile app · Office & notes

Tuta Calendar

Quantum-safe encrypted planner to schedule & manage your events & sync calendars.

Free, with trade-offs
Android and iOS
Open source

Ad-supported exit link (Clictune): an intermediate page may show for a few seconds before the official website. Direct link to the website, no intermediate page

Download for Android (F-Droid)

Link to the official download page, ad-supported (Clictune): an intermediate page may show for a few seconds. Direct link to the download

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Geographic availability: No geographic restriction found in our sources; availability is not checked country by country.

Technical details

Pricing: Free, with trade-offsconfirmed by F-Droid
License: GPL-3.0+ — Open source (copyleft)confirmed by F-Droid
Open source: Yes
Commercial use: Yesconfirmed by F-Droid
Account required: not documented
Credit card required: Noconfirmed by F-Droid
Watermark: Not applicable
Ads: No
Platforms: Android and iOSEstablished by Android: F-Droid, Unspecified source · iOS: Unspecified source
Publisher: Tutao GmbH
Latest version: 365.261030.0 (6 November 2026)
Latest activity: 6 November 2026
Source code: github.com/tutao/tutanota

Overview

Tuta Calendar is a calendar mobile app, available on Android and iOS.

Features described in its F-Droid listing and on its official website: end-to-end encryption, data encryption and offline use.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information

“Take your privacy to the next level with the secure Tuta Calendar app.” — F-Droid, 10 November 2026
“Quantum-safe encryption: End-to-end encrypted data exchange with all Tuta Calendar users and with users of other calendar apps (via optional password-protected event invites).” — F-Droid, 10 November 2026
“Quantum-safe encryption: End-to-end encrypted data exchange with all Tuta Calendar users and with users of other calendar apps (via optional password-protected event invites).” — F-Droid, 10 November 2026
“OFFLINE SUPPORT: Independent standalone app so you can check your schedule both online and offline!” — F-Droid, 10 November 2026

At a glance

Tuta Calendar is free, with trade-offs: it relies on a non-free online service.

Its licence (GPL-3.0+) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

Open source code
No advertising
Commercial use allowed

Weaknesses

Flagged by F-Droid: relies on a non-free online service

Sources and checks

Facts collected from Unspecified source (platforms) — 9 November 2026
Facts collected from F-Droid (credit card, source code, publisher, licence, free status, platforms, ads, commercial use, version) — 6 November 2026
Last technical check: 6 November 2026
Description from F-Droid — F-Droid (citation courte)

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