Compare software

DAVx⁵EteSync
Free

The open-source edition is available at no cost from F-Droid.

 Freemium

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

Android Android, iOS, Web, Self-hosted
  • Two-way sync of contacts, calendars and tasks in one app
  • Works with the calendar and contacts apps already installed
  • Zero-knowledge end-to-end encryption
  • Works with existing contact and calendar apps
  • Android only
  • Needs a CalDAV, CardDAV or WebDAV server to sync with
  • Hosted service requires a paid plan after the trial
  • Desktop apps need the separate DAV bridge
Downloadable app Downloadable app, Web application, Self-hosted, Hosted service
Open source Open source
License not stated 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 September 24, 2026

Checked October 1, 2026

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