EteSync

An end-to-end encrypted sync service for contacts, calendars, tasks and notes that backs up and synchronizes data across devices and to the cloud while keeping it private from the provider. It is for individual consumers and businesses of any size that need to sync personal information across major platforms using their existing apps. It differentiates with zero-knowledge encryption, fully open-source clients and server, and a journaled tamper-proof history that allows reviewing and reverting changes, offered as a hosted service or self-hosted instance.

Key features

• Sync contacts across devices
• Sync calendars across devices
• Sync tasks across devices
• Sync notes across devices
• End-to-end zero-knowledge encryption
• Open source clients and server
• Journaled tamper-proof change history
• Review replay and revert changes
• Integrates with existing apps
• Self-hostable instance option