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DAVx⁵vdirsyncer
Free

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

 Free

Free and open source.

Android macOS, Linux, Command line
  • Two-way sync of contacts, calendars and tasks in one app
  • Works with the calendar and contacts apps already installed
  • Two-way sync for CalDAV and CardDAV
  • Keeps calendars and contacts as local files
  • Android only
  • Needs a CalDAV, CardDAV or WebDAV server to sync with
  • Command line only, with no graphical interface
  • Needs a configuration file before first use
Downloadable app Downloadable app
Open source Open source
License not stated License: BSD-3-Clause
Not stated if an account is needed No account needed
Not stated if it works offline Works offline

Checked September 24, 2026

Checked October 2, 2026

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