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SOGo vs Radicale: catalog facts
SOGo	Radicale
Free Free and open source; paid premium support is offered separately.	Free Free to run on your own server.
Web, Self-hosted	Self-hosted
Webmail, calendars and contacts in one self-hosted server CalDAV, CardDAV and ActiveSync support for native and mobile clients	Standard CalDAV and CardDAV support Small and light enough for modest hardware
Needs existing mail and directory servers to integrate with Outlook support depends on a separate CalDAV synchronizer	You set up and maintain the server yourself Only handles calendars and contacts, not mail or files
Self-hosted	Self-hosted
Open source	Open source
License: GPL-2.0-or-later / LGPL-2.0-or-later	License not stated
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 24, 2026

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