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Kaidan vs Siskin IM: catalog facts
Kaidan	Siskin IM
Free Free to download and use; developed within the KDE community.	Free Free; source code is published on GitHub.
Linux	iOS
Works with any XMPP server instead of a single provider End-to-end encrypted messaging	OMEMO end-to-end encryption Audio and video calls over XMPP
Developers note it still lacks some basic features Has known stability issues	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 24, 2026	Official website Full listing and sources Checked October 1, 2026

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