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Radicale vs Xandikos: catalog facts
Radicale	Xandikos
Free Free to run on your own server.	Free Free and open source under the GPL-3.0 licence.
Self-hosted	Linux, Self-hosted
Standard CalDAV and CardDAV support Small and light enough for modest hardware	Git-backed storage with change history Broad, documented standards coverage
You set up and maintain the server yourself Only handles calendars and contacts, not mail or files	No built-in web interface for managing calendars WebDAV LOCK operations not implemented
Self-hosted	Self-hosted
Open source	Open source
License not stated	License: GPL-3.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 2, 2026

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