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Kupfer vs Quicksilver: catalog facts
Kupfer	Quicksilver
Free Free and open source under the GNU GPL.	Free Free and open source, maintained by a community of developers.
Linux	macOS
Object-and-action workflow like Quicksilver Extensible through plugins	Acts on files and apps, not only launching them Hundreds of plugins
Linux only Slower development pace than newer launchers	macOS only The action-based workflow takes time to learn
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 September 23, 2026

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