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Kupfer vs Walker: catalog facts
Kupfer	Walker
Free Free and open source under the GNU GPL.	Free Free to download and build from the public repository.
Linux	Linux
Object-and-action workflow like Quicksilver Extensible through plugins	Launches apps, runs commands and calculates from one prompt Native GTK4 interface
Linux only Slower development pace than newer launchers	Linux only Many options to configure before it fits your setup
Downloadable app	Downloadable app
Open source	Closed 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 September 23, 2026

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