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Gajim vs Siskin IM: catalog facts
Gajim	Siskin IM
Free Free and open source, funded by donations.	Free Free; source code is published on GitHub.
Windows, Linux	iOS
Works with any XMPP provider and interoperates with other XMPP apps End-to-end encryption including OMEMO and OpenPGP	OMEMO end-to-end encryption Audio and video calls over XMPP
Needs an XMPP account from a provider or your own server Contacts must also use XMPP to reach them	iPhone and iPad only Needs an XMPP account on a server
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 September 23, 2026	Official website Full listing and sources Checked October 1, 2026

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