Compare software

SOGoSnappyMail
Free

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

 Free

Free and open source.

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
  • Very small download and fast loading on mobile
  • Maintained successor to RainLoop
  • Needs existing mail and directory servers to integrate with
  • Outlook support depends on a separate CalDAV synchronizer
  • Requires your own web server and mail server
  • Drops support for older browsers
Self-hosted Self-hosted
Open source Open source
License: GPL-2.0-or-later / LGPL-2.0-or-later License: AGPL-3.0
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

Checked September 23, 2026

Checked September 23, 2026

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