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mIRC vs Irssi: catalog facts
mIRC	Irssi
Paid Shareware that can be tried, with a paid registration from the official site.	Free Free and open source.
Windows	macOS, Linux, Command line
Mature client with over thirty years of development Still receiving releases	Runs in any terminal, including over SSH Scriptable and highly configurable
Windows only Proprietary shareware requiring registration	Keyboard and command driven, with a learning curve IRC only, no other chat protocols
Downloadable app	Downloadable app
Closed source	Open source
License not stated	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 September 24, 2026	Official website Full listing and sources Checked September 24, 2026

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