Proton Calendar provides a calendar app from Proton, with options for free accounts and business use.
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24 alternativesTuta Calendar
Tuta Calendar encrypts schedules and events, with personal and business account options listed on its calendar service page.
About Tuta Calendar
Tuta Calendar is an online calendar service from Tuta, the company formerly known as Tutanota. Its homepage describes it as an encrypted calendar for personal and professional scheduling, with events, invitations and shared calendars encrypted end-to-end. The homepage also describes a zero-knowledge architecture and quantum-safe encryption. It lists apps for Android and iOS, a browser version, and desktop clients for Windows, macOS and Linux. Users can share calendars with family, an organization or a company, and the calendar is integrated with Tuta's encrypted email and contacts.
The homepage offers a free account and a Tuta Business option for professional use, which it says is in line with GDPR. The homepage does not state plan details or prices, so pricing is unconfirmed. The security and privacy statements are the vendor's own descriptions and have not been independently verified here. The homepage also describes two-factor authentication as something users switch on themselves.
Key features
- End-to-end encryption for events, invitations and shared calendars
- Zero-knowledge architecture described on the homepage
- Quantum-safe encryption, as described by the vendor
- Push notifications that the homepage says are sent securely
- Optional two-factor authentication for login credentials
- Calendar sharing with family, organizations or companies
Best for: Individuals and small teams who want encrypted scheduling and calendar sharing and are willing to rely on the vendor's security descriptions.
Good for
- The homepage describes encryption applied automatically to scheduling, invitations and sharing
- Integrates with encrypted email and contacts in one place
- Available on Android, iOS, web, and Windows, macOS and Linux desktop clients
Watch out for
- Pricing and plan details are not confirmed by the source
- Two-factor authentication must be turned on by the user
Tuta Calendar at a glance
- Website
- tuta.com/calendar
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Android, iOS, Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
Tuta Calendar alternatives
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Tuta Calendar FAQ
What is Tuta?
The homepage says Tuta, formerly Tutanota, launched in 2014 and offers encrypted email, calendar and contacts services, including a free option for private use.
Is the information on Tuta Calendar safe?
The homepage states that end-to-end encryption protects events and push reminders. These are the vendor's own descriptions, and the homepage does not guarantee safety.
Can I share my calendar with other people?
Yes. The homepage says calendars and events can be shared with family, an organization or a company.
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