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Psi vs Gajim: catalog facts
Psi	Gajim
Free Free and open source under the GNU General Public License.	Free Free and open source, funded by donations.
Windows, macOS, Linux	Windows, Linux
OMEMO, OTR and OpenPGP encryption via plugins Very flexible interface with multi-window and all-in-one modes	Works with any XMPP provider and interoperates with other XMPP apps End-to-end encryption including OMEMO and OpenPGP
Last tagged release dates from 2020 Aimed at experienced users rather than newcomers	Needs an XMPP account from a provider or your own server Contacts must also use XMPP to reach them
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 23, 2026

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