EteSync
End-to-end encrypted sync for calendars, contacts, tasks and notes
1.8k stars 102 forks last commit first released AGPL-3.0
Likely dormant
No commits since 12 Jul 2024. Expect to maintain it yourself or pick an alternative.
EteSync is a privacy-focused synchronization service built around zero-knowledge, end-to-end encryption, designed for syncing personal information such as calendars, contacts, tasks, and notes. The self-hostable server component (Etebase Server, formerly referred to as EteSync 2.0) provides the backend that EteSync clients connect to.
Key Features
- Zero-knowledge end-to-end encryption, so the server cannot read user data
- Sync backend for calendars, contacts, tasks, and notes via EteSync clients
- Encrypted, tamper-resistant change journal for history, review, and replay of changes
- Django-based administration for managing users and server configuration
- Supports reverse-proxy deployments and production setups with TLS termination
Use Cases
- Privately sync contacts and calendars across mobile and desktop devices without exposing data to the server operator
- Run a personal or family sync service with full control over storage and backups
- Maintain an auditable history of changes to synced data for recovery and rollback
Limitations and Considerations
- Requires compatible EteSync/Etebase client applications; it is not a generic CalDAV/CardDAV server
- Production deployments need careful TLS and reverse-proxy configuration to preserve correct host headers
EteSync is a solid choice for users who want modern encrypted synchronization with strong privacy guarantees. Self-hosting the Etebase Server provides full data ownership while keeping the convenience of multi-device sync through supported clients.
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