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Roundcube vs SOGo: catalog facts
Roundcube	SOGo
Free Free and open source webmail software.	Free Free and open source; paid premium support is offered separately.
Web, Self-hosted	Web, Self-hosted
Application-like webmail interface for any IMAP server Address book with LDAP connectors	Webmail, calendars and contacts in one self-hosted server CalDAV, CardDAV and ActiveSync support for native and mobile clients
Requires a PHP web server and an existing mail server Only a webmail front end, not a mail server itself	Needs existing mail and directory servers to integrate with Outlook support depends on a separate CalDAV synchronizer
Self-hosted	Self-hosted
Open source	Open source
License not stated	License: GPL-2.0-or-later / LGPL-2.0-or-later
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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