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Xandikos vs Cyrus IMAP: catalog facts
Xandikos	Cyrus IMAP
Free Free and open source under the GPL-3.0 licence.	Free Free and open source.
Linux, Self-hosted	Linux, Self-hosted
Git-backed storage with change history Broad, documented standards coverage	Mail, calendars and contacts in one server JMAP support alongside IMAP
No built-in web interface for managing calendars WebDAV LOCK operations not implemented	Complex to configure compared with all-in-one servers No bundled webmail
Self-hosted	Self-hosted
Open source	Open source
License: GPL-3.0	License not stated
Not stated if an account is needed	No account needed
Not stated if it 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.