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Horde Groupware vs SnappyMail: catalog facts
Horde Groupware	SnappyMail
Free Free and open source with no paid tier.	Free Free and open source.
Web, Self-hosted	Web, Self-hosted
Full groupware suite beyond mail, including tasks, notes and time tracking CalDAV, CardDAV and ActiveSync sync	Very small download and fast loading on mobile Maintained successor to RainLoop
Requires running and maintaining a PHP server Older codebase with a long history of security fixes to track	Requires your own web server and mail server Drops support for older browsers
Self-hosted	Self-hosted
Open source	Open source
License: LGPL/GPL	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
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.