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Psi vs Monal: catalog facts
Psi	Monal
Free Free and open source under the GNU General Public License.	Free Free and open source under a BSD license.
Windows, macOS, Linux	macOS, iOS
OMEMO, OTR and OpenPGP encryption via plugins Very flexible interface with multi-window and all-in-one modes	Native app for iOS, iPadOS and macOS Works with any XMPP server, including self-hosted ones
Last tagged release dates from 2020 Aimed at experienced users rather than newcomers	Apple platforms only Needs an XMPP account from a provider or your own server
Downloadable app	Downloadable app
Open source	Open source
License: GPL	License: BSD
Not stated if an account is needed	Account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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