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Kopuz vs Rufin: catalog facts
Kopuz	Rufin
Free Free and open source under the EUPL-1.2, supported by sponsors.	Free Free and open source under the GPL-3.0-or-later licence.
Windows, macOS, Linux, Android	Linux
Local files and many music services in one library Synced and word-timed lyrics display	Plays local files and music server libraries in one app Native desktop application rather than a web wrapper
Apple Music playback only works on desktop Streaming sources need accounts with those services	Young project with a small user base Supported servers are not detailed in the research
Downloadable app	Downloadable app
Open source	Open source
License: EUPL-1.2	License: GPL-3.0-or-later
Not stated if an account is needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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