Tuta Calendar
German end-to-end encrypted calendar by Tutao GmbH, tightly integrated with Tuta Mail. All calendar data is encrypted on German servers using post-quantum TutaCrypt encryption. Standalone calendar app launched in 2024. Open source, no ads, no tracking.
Quick facts
Headquarters Hanover, Germany
Company Tutao GmbH
Founded 2024
Ownership Independent
Hosting 🇩🇪 Germany
Infrastructure Own infrastructure
Data jurisdiction EU
Open source Full
GDPR Compliant
Pricing Freemium · from Free
Free tier Yes
Platforms Web, iOS, Android, Desktop
Languages
ENDEFRESITNLPTPL
100 · Certified European
Try for free Why does it score 100?
Legal jurisdiction
EU member-state HQ
30/30Ownership & control
Independent ownership
25/25Data sovereignty
Own infrastructure
30/30Accountability & trust
Fully open source + GDPR
12/15Independence bonus
Bootstrapped, no outside investors
+5EuroPoints total
100/100
See how they compare
Tuta Calendar
Proton CalendarEuroPoints
Certified European
Certified European
Legal jurisdiction
Ownership & control
Data sovereignty
Accountability & trust
Independence bonus
Headquarters
Hanover, Germany
Geneva, Switzerland
Founded
2024
2019
—
Open source
Full
Full
—
Infrastructure
Own infrastructure
Own infrastructure
—
GDPR
Free tier
Pricing
Freemium · from Free
Freemium · from Free
—
Platforms
Web, iOS, Android, Desktop
Web, iOS, Android
—
Languages
en, de, fr, es, it, nl, pt, pl
en, fr, de, es, it, nl, pt, pl
—
What does it replace?
Google Calendar 
Apple Calendar 
Outlook More European Calendar & contacts alternatives
#1
Proton Calendar
95 · Certified EuropeanSwiss end-to-end encrypted calendar by Proton AG. All event details (titles, descriptions, locations, attendees) are encrypted so even Proton cannot read them. ISO 27001 certified, independently audited annually by Securitum, own infrastructure in Switzerland and Germany.