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vdirsyncer vs DAVx⁵: catalog facts
vdirsyncer	DAVx⁵
Free Free and open source.	Free The open-source edition is available at no cost from F-Droid.
macOS, Linux, Command line	Android
Two-way sync for CalDAV and CardDAV Keeps calendars and contacts as local files	Two-way sync of contacts, calendars and tasks in one app Works with the calendar and contacts apps already installed
Command line only, with no graphical interface Needs a configuration file before first use	Android only Needs a CalDAV, CardDAV or WebDAV server to sync with
Downloadable app	Downloadable app
Open source	Open source
License: BSD-3-Clause	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 24, 2026

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