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Kopuz vs Aonsoku: catalog facts
Kopuz	Aonsoku
Free Free and open source under the EUPL-1.2, supported by sponsors.	Free Free and open source under the MIT licence.
Windows, macOS, Linux, Android	Linux
Local files and many music services in one library Synced and word-timed lyrics display	Works with Navidrome and other Subsonic-compatible servers Desktop app instead of a browser tab
Apple Music playback only works on desktop Streaming sources need accounts with those services	Needs a Navidrome or Subsonic server to connect to The homepage offers almost no documentation
Downloadable app	Downloadable app
Open source	Open source
License: EUPL-1.2	License: MIT
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.