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KVIrc vs Irssi: catalog facts
KVIrc	Irssi
Free Free to download and use; donations are accepted.	Free Free and open source.
Windows, macOS, Linux	macOS, Linux, Command line
Built-in scripting language with documented API Themes, addons and translations available	Runs in any terminal, including over SSH Scriptable and highly configurable
IRC only, no other chat protocols Many options can feel heavy for casual use	Keyboard and command driven, with a learning curve IRC only, no other chat protocols
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: GPL-2.0
No account needed	No account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 24, 2026

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