Proton Calendar
Proton Calendar is an encrypted calendar service launched in spring 2022...
Why It Doesn't Collaborate
Proton Calendar cannot collaborate with governments...
100%
Events Encrypted
AES-256
Encryption
0
Plain Text
Open Source
Auditable
Detailed Analysis
Encryption scope — more than you'd expect
Proton Calendar encrypts every element of your events...
Encrypted invitations
When you invite someone to an event...
What Proton CAN provide to authorities:
- Account creation date
- Connection IP (if logging enabled)
- Number of calendars/events (metadata only)
What Proton CANNOT provide:
- Event titles (encrypted)
- Event descriptions (encrypted)
- Locations (encrypted)
- Guest lists (encrypted)
- R reminders (encrypted)
Contrast with Big Tech calendars
Google Calendar, Apple Calendar, and Microsoft Outlook...
⚠️ Critical: Most calendar services sell your schedule data for advertising profiling. Proton Calendar makes this technically impossible.
Frequently Asked Questions
Can Proton read my calendar events?+
No. All events are end-to-end encrypted on your device...
Are shared invites private?+
Yes. Invitee information is encrypted so no one can know their identity...
How does it compare to Google Calendar?+
Google can read and profile your entire schedule. Proton cannot — all data is encrypted.
Can I share calendar events?+
Yes. Invitations are cryptographically signed and verified, ensuring authenticity.