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Radicale vs Cyrus IMAP: catalog facts
Radicale	Cyrus IMAP
Free Free to run on your own server.	Free Free and open source.
Self-hosted	Linux, Self-hosted
Standard CalDAV and CardDAV support Small and light enough for modest hardware	Mail, calendars and contacts in one server JMAP support alongside IMAP
You set up and maintain the server yourself Only handles calendars and contacts, not mail or files	Complex to configure compared with all-in-one servers No bundled webmail
Self-hosted	Self-hosted
Open source	Open source
License not stated	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 September 24, 2026	Official website Full listing and sources Checked September 24, 2026

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