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Nocturne vs Kopuz: catalog facts
Nocturne	Kopuz
Free Free and open source under the GPL-3.0-or-later.	Free Free and open source under the EUPL-1.2, supported by sponsors.
Linux	Windows, macOS, Linux, Android
Automatic synced lyrics Caching keeps large libraries responsive	Local files and many music services in one library Synced and word-timed lyrics display
Built around Navidrome as the library backend Linux only	Apple Music playback only works on desktop Streaming sources need accounts with those services
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: EUPL-1.2
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	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.