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Nextcloud Calendar vs tine Groupware: catalog facts
Nextcloud Calendar	tine Groupware
Free Free app for Nextcloud servers.	Free Open-source software; the research does not detail any paid offerings.
Web, Self-hosted	Web, Self-hosted
Calendars stay on your own server CalDAV sync with standard clients	Email, calendar, contacts and tasks in one platform Resource planning for shared appointments
Requires a running Nextcloud server Not a standalone app	Website and documentation mostly in German Aimed at organisations rather than individual users
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 October 2, 2026

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