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
- Hosting
- 🇩🇪 Germany
- Company
- Tutao GmbH
- Founded
- 2024
- Ownership
- Independent
- Infrastructure
- Own infrastructure
- Open source
- Full
- GDPR
- Compliant
- Pricing
- Freemium · from Free
- Free tier
- Yes
- Platforms
- Web, Ios, Android, Desktop
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
Pricing & availability
Pricing modelFreemium
Starting priceFree
Free tierYes
PlatformsWebiOSAndroidDesktop
Languages
ENDEFRESITNLPTPL
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.