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XandikosEteSync
Free

Free and open source under the GPL-3.0 licence.

 Freemium

The hosted service is paid after a free trial; running your own server is free.

Linux, Self-hosted Android, iOS, Web, Self-hosted
  • Git-backed storage with change history
  • Broad, documented standards coverage
  • Zero-knowledge end-to-end encryption
  • Works with existing contact and calendar apps
  • No built-in web interface for managing calendars
  • WebDAV LOCK operations not implemented
  • Hosted service requires a paid plan after the trial
  • Desktop apps need the separate DAV bridge
Self-hosted Downloadable app, Web application, Self-hosted, Hosted service
Open source Open source
License: GPL-3.0 License not stated
Not stated if an account is needed Account needed
Not stated if it works offline Not stated if it works offline

Checked October 2, 2026

Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.