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EteSync vs vdirsyncer: catalog facts
EteSync	vdirsyncer
Freemium The hosted service is paid after a free trial; running your own server is free.	Free Free and open source.
Android, iOS, Web, Self-hosted	macOS, Linux, Command line
Zero-knowledge end-to-end encryption Works with existing contact and calendar apps	Two-way sync for CalDAV and CardDAV Keeps calendars and contacts as local files
Hosted service requires a paid plan after the trial Desktop apps need the separate DAV bridge	Command line only, with no graphical interface Needs a configuration file before first use
Downloadable app, Web application, Self-hosted, Hosted service	Downloadable app
Open source	Open source
License not stated	License: BSD-3-Clause
Account needed	No account needed
Not stated if it works offline	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.