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