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Kopuz vs Nocturne: catalog facts
Kopuz	Nocturne
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.
Windows, macOS, Linux, Android	Linux
Local files and many music services in one library Synced and word-timed lyrics display	Automatic synced lyrics Caching keeps large libraries responsive
Apple Music playback only works on desktop Streaming sources need accounts with those services	Built around Navidrome as the library backend Linux only
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	Not stated if an account is 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.