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K-19 Player vs Feishin: catalog facts
K-19 Player	Feishin
Free Free and open source under GPL-3.0-only.	Free The open-source application is available without a license fee.
Android	Windows, macOS, Linux
Works with OpenSubsonic-compatible servers Includes background audio	Multiple playback backends and lyric display
Requires an OpenSubsonic-compatible music server	Requires a supported music server.
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-only	License: GPL-3.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked September 22, 2026

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