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Amperfy vs K-19 Player: catalog facts
Amperfy	K-19 Player
Free Free to use; the developer accepts donations.	Free Free and open source under GPL-3.0-only.
macOS, iOS	Android
Native app for iPhone, iPad and Mac Works with Ampache and Subsonic servers	Works with OpenSubsonic-compatible servers Includes background audio
Requires your own Ampache or Subsonic server No Android or Windows version	Requires an OpenSubsonic-compatible music server
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-only
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 2, 2026	Official website Full listing and sources Checked October 8, 2026

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