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DAViCal vs Cyrus IMAP: catalog facts
DAViCal	Cyrus IMAP
Free Free software under the GNU General Public License.	Free Free and open source.
Linux, Self-hosted	Linux, Self-hosted
Calendar delegation and shared access between users Free/busy scheduling for meetings	Mail, calendars and contacts in one server JMAP support alongside IMAP
Requires PostgreSQL and a PHP web server Setup is more involved than lighter CalDAV servers	Complex to configure compared with all-in-one servers No bundled webmail
Self-hosted	Self-hosted
Open source	Open source
License: GPL-2.0	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.