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Kopuz vs Moosync: catalog facts
Kopuz	Moosync
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 Spotify and YouTube tracks alongside local music Theme engine and extension API
Apple Music playback only works on desktop Streaming sources need accounts with those services	Streaming features depend on third-party services Small community
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.