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DavMail vs vdirsyncer: catalog facts
DavMail	vdirsyncer
Free Free and open source under the GPL-2.0 licence, with optional donations.	Free Free and open source.
Windows, macOS, Linux, Self-hosted	macOS, Linux, Command line
Covers mail, calendar, contacts and directory in one gateway Works with on-premises Exchange and Exchange Online	Two-way sync for CalDAV and CardDAV Keeps calendars and contacts as local files
Requires configuring each client to use the gateway Java application rather than a native interface	Command line only, with no graphical interface Needs a configuration file before first use
Downloadable app, Self-hosted	Downloadable app
Open source	Open source
License: GPL-2.0	License: BSD-3-Clause
Not stated if an account is needed	No account needed
Needs internet	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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