EteSync
Encrypted calendar and contacts sync that plugs into your apps.
etesync.com- Price
- FreeOpen source and free to self-host; paid hosting is roughly $2 to $4/mo after a two-week trial.
- Works on
- Windows, macOS, Linux, Android, iOS, Web
- Based in
- United Kingdom
- Source code
- Open source
- Encryption
- End-to-end encrypted
EteSync gives you end-to-end encrypted calendar, contacts, and tasks that sync into the apps you already use, with notes handled by a separate companion app. It is zero-knowledge so the server cannot read any of it and it keeps an encrypted, tamper-evident history you can roll back. Rather than a standard remote CalDAV endpoint, it bridges into your phone or desktop through its own sync adapter. Self-host the server for free, or pay for hosting. Choose it if you want encrypted sync that disappears into the apps you already use.
The iOS app has not been updated since 2020.
Strengths
- Zero-knowledge encryption for calendar, contacts, and tasks
- Plugs into your existing apps through its sync adapter
- Open source; self-host for free
- Encrypted history you can roll back
Considerations
- Not a standard remote CalDAV endpoint
- Hosted plan is a trial, then paid
- iOS app not updated since 2020
Listed inCalendars
