Compare software

Nextcloud Mail vs Horde Groupware: catalog facts
Nextcloud Mail	Horde Groupware
Free Free and open source; installed as an app on a Nextcloud server.	Free Free and open source with no paid tier.
Web, Self-hosted	Web, Self-hosted
Runs on your own Nextcloud server Works with existing IMAP accounts	Full groupware suite beyond mail, including tasks, notes and time tracking CalDAV, CardDAV and ActiveSync sync
Needs a working Nextcloud installation Does not host mailboxes itself	Requires running and maintaining a PHP server Older codebase with a long history of security fixes to track
Self-hosted	Self-hosted
Open source	Open source
License not stated	License: LGPL/GPL
Not stated if an account is 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 September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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