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Horde Groupware vs Nextcloud Calendar: catalog facts
Horde Groupware	Nextcloud Calendar
Free Free and open source with no paid tier.	Free Free app for Nextcloud servers.
Web, Self-hosted	Web, Self-hosted
Full groupware suite beyond mail, including tasks, notes and time tracking CalDAV, CardDAV and ActiveSync sync	Calendars stay on your own server CalDAV sync with standard clients
Requires running and maintaining a PHP server Older codebase with a long history of security fixes to track	Requires a running Nextcloud server Not a standalone app
Self-hosted	Self-hosted
Open source	Open source
License: LGPL/GPL	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 23, 2026	Official website Full listing and sources Checked October 2, 2026

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