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Supersonic vs Kopuz: catalog facts
Supersonic	Kopuz
Free The open-source software is available without a license fee. Hosting, hardware and…	Free Free and open source under the EUPL-1.2, supported by sponsors.
Windows, macOS, Linux	Windows, macOS, Linux, Android
Provides a native desktop interface with gapless playback.	Local files and many music services in one library Synced and word-timed lyrics display
Requires access to a supported music server.	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	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 September 22, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.