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Nextcloud Mail vs Roundcube: catalog facts
Nextcloud Mail	Roundcube
Free Free and open source; installed as an app on a Nextcloud server.	Free Free and open source webmail software.
Web, Self-hosted	Web, Self-hosted
Runs on your own Nextcloud server Works with existing IMAP accounts	Application-like webmail interface for any IMAP server Address book with LDAP connectors
Needs a working Nextcloud installation Does not host mailboxes itself	Requires a PHP web server and an existing mail server Only a webmail front end, not a mail server itself
Self-hosted	Self-hosted
Open source	Open source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Needs internet
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.