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mIRC vs KVIrc: catalog facts
mIRC	KVIrc
Paid Shareware that can be tried, with a paid registration from the official site.	Free Free to download and use; donations are accepted.
Windows	Windows, macOS, Linux
Mature client with over thirty years of development Still receiving releases	Built-in scripting language with documented API Themes, addons and translations available
Windows only Proprietary shareware requiring registration	IRC only, no other chat protocols Many options can feel heavy for casual use
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	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 2, 2026

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