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Siskin IM vs Gajim: catalog facts
Siskin IM	Gajim
Free Free; source code is published on GitHub.	Free Free and open source, funded by donations.
iOS	Windows, Linux
OMEMO end-to-end encryption Audio and video calls over XMPP	Works with any XMPP provider and interoperates with other XMPP apps End-to-end encryption including OMEMO and OpenPGP
iPhone and iPad only Needs an XMPP account on a server	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 not stated	License not stated
Account needed	Account needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 23, 2026

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