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Cypht vs Nextcloud Mail: catalog facts
Cypht	Nextcloud Mail
Free Free and open source under the LGPL v2.1.	Free Free and open source; installed as an app on a Nextcloud server.
Web, Self-hosted	Web, Self-hosted
Unified views across many email accounts Supports IMAP, JMAP and Exchange EWS	Runs on your own Nextcloud server Works with existing IMAP accounts
Needs a PHP server or Docker to run Less polished than commercial webmail	Needs a working Nextcloud installation Does not host mailboxes itself
Self-hosted	Self-hosted
Open source	Open source
License: LGPL-2.1	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.