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