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Moosync vs Kopuz: catalog facts
Moosync	Kopuz
Free Free and open source under the GPL-3.0-or-later licence.	Free Free and open source under the EUPL-1.2, supported by sponsors.
Linux	Windows, macOS, Linux, Android
Plays Spotify and YouTube tracks alongside local music Theme engine and extension API	Local files and many music services in one library Synced and word-timed lyrics display
Streaming features depend on third-party services Small community	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
No account 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.