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

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