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Nextcloud CalendarSOGo
Free

Free app for Nextcloud servers.

 Free

Free and open source; paid premium support is offered separately.

Web, Self-hosted Web, Self-hosted
  • Calendars stay on your own server
  • CalDAV sync with standard clients
  • Webmail, calendars and contacts in one self-hosted server
  • CalDAV, CardDAV and ActiveSync support for native and mobile clients
  • Requires a running Nextcloud server
  • Not a standalone app
  • 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
Account needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked October 2, 2026

Checked September 23, 2026

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