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K-19 Player vs Plexamp: catalog facts
K-19 Player	Plexamp
Free Free and open source under GPL-3.0-only.	Freemium Free to use, with some features reserved for paid Plex Pass subscribers.
Android	Windows, macOS, Linux, Android, iOS
Works with OpenSubsonic-compatible servers Includes background audio	Dedicated music player built around a Plex library Available on desktop and mobile platforms
Requires an OpenSubsonic-compatible music server	Depends on a Plex Media Server holding your music Some features require a paid Plex Pass
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	Not stated if it 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.