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SOGo vs Cypht: catalog facts
SOGo	Cypht
Free Free and open source; paid premium support is offered separately.	Free Free and open source under the LGPL v2.1.
Web, Self-hosted	Web, Self-hosted
Webmail, calendars and contacts in one self-hosted server CalDAV, CardDAV and ActiveSync support for native and mobile clients	Unified views across many email accounts Supports IMAP, JMAP and Exchange EWS
Needs existing mail and directory servers to integrate with Outlook support depends on a separate CalDAV synchronizer	Needs a PHP server or Docker to run Less polished than commercial webmail
Self-hosted	Self-hosted
Open source	Open source
License: GPL-2.0-or-later / LGPL-2.0-or-later	License: LGPL-2.1
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 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.