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