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Radicale vs Nextcloud Calendar: catalog facts
Radicale	Nextcloud Calendar
Free Free to run on your own server.	Free Free app for Nextcloud servers.
Self-hosted	Web, Self-hosted
Standard CalDAV and CardDAV support Small and light enough for modest hardware	Calendars stay on your own server CalDAV sync with standard clients
You set up and maintain the server yourself Only handles calendars and contacts, not mail or files	Requires a running Nextcloud server Not a standalone app
Self-hosted	Self-hosted
Open source	Open source
License not stated	License not stated
Not stated if an account is needed	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 October 2, 2026

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