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Roundcube vs Cypht: catalog facts
Roundcube	Cypht
Free Free and open source webmail software.	Free Free and open source under the LGPL v2.1.
Web, Self-hosted	Web, Self-hosted
Application-like webmail interface for any IMAP server Address book with LDAP connectors	Unified views across many email accounts Supports IMAP, JMAP and Exchange EWS
Requires a PHP web server and an existing mail server Only a webmail front end, not a mail server itself	Needs a PHP server or Docker to run Less polished than commercial webmail
Self-hosted	Self-hosted
Open source	Open source
License not stated	License: LGPL-2.1
Not stated if an account is needed	Not stated if an account is needed
Needs internet	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.