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.
EteSync
Encrypted calendar and contacts sync that plugs into your apps.
etesync.com
FreeOpen SourceE2E EncryptedWindowsmacOSLinuxAndroidiOSWebUnited Kingdom
Pricing Open source and free to self-host; paid hosting is roughly $2 to $4/mo after a two-week trial.
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
Listed in Calendars
