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Kopuz vs Nuclear: catalog facts
Kopuz	Nuclear
Free Free and open source under the EUPL-1.2, supported by sponsors.	Free Free and open source under the AGPL-3.0 licence.
Windows, macOS, Linux, Android	Windows, macOS, Linux
Local files and many music services in one library Synced and word-timed lyrics display	Streams from multiple sources, extendable with plugins Playlist import from other services and JSON files
Apple Music playback only works on desktop Streaming sources need accounts with those services	Desktop only, no mobile app macOS may block the app on first launch
Downloadable app	Downloadable app
Open source	Open source
License: EUPL-1.2	License: AGPL-3.0-only
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.