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Kaidan vs Psi: catalog facts
Kaidan	Psi
Free Free to download and use; developed within the KDE community.	Free Free and open source under the GNU General Public License.
Linux	Windows, macOS, Linux
Works with any XMPP server instead of a single provider End-to-end encrypted messaging	OMEMO, OTR and OpenPGP encryption via plugins Very flexible interface with multi-window and all-in-one modes
Developers note it still lacks some basic features Has known stability issues	Last tagged release dates from 2020 Aimed at experienced users rather than newcomers
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL
Account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 24, 2026

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