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K-19 Player vs Symfonium: catalog facts
K-19 Player	Symfonium
Free Free and open source under GPL-3.0-only.	Paid One-time purchase with a free trial on Google Play; no subscription.
Android	Android
Works with OpenSubsonic-compatible servers Includes background audio	Connects to many self-hosted media servers Hi-Res, DSD and USB DAC output with AutoEQ
Requires an OpenSubsonic-compatible music server	Android only Paid after the trial
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0-only	License not stated
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 8, 2026	Official website Full listing and sources Checked September 23, 2026

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