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Kupfer vs KRunner: catalog facts
Kupfer	KRunner
Free Free and open source under the GNU GPL.	Free Free and open source as part of KDE Plasma.
Linux	Linux
Object-and-action workflow like Quicksilver Extensible through plugins	Built into Plasma, with no extra install on most setups Extended by plugins called runners
Linux only Slower development pace than newer launchers	Tied to the KDE Plasma desktop Some runners need an extra addons package
Downloadable app	Downloadable app
Open source	Open source
License: GPL	License not stated
No account needed	No account needed
Works offline	Works offline
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.