EteSync
Encrypted sync for calendar, contacts and tasks. Works with your existing apps.
Description
EteSync syncs your calendars, contacts and tasks with end-to-end encryption. The server never sees your data in plaintext. Works with the calendar/contacts apps you already use (DAVx5 on Android, native apps on iOS). The service is self-hostable. More niche than Proton Calendar, but encryption covers everything.
Strengths
- E2E encryption for calendar and contacts
- CalDAV/CardDAV compatible
- Self-hostable
Limitations
- Smaller community
- Technical initial setup
- Basic web interface
Recommended for
- Encrypted cross-device sync
- Self-hosting calendar/contacts
Compared to alternatives
EteSync encrypts everything (calendar, contacts, tasks) end-to-end. Proton Calendar is simpler but limited to calendar. Nextcloud Calendar is the most flexible for self-hosting.