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StreamMusic vs Ultrasonic: catalog facts
StreamMusic	Ultrasonic
Free Downloadable from the official site and the App Store; the app is not open source.	Free Free and open source under the GPL-3.0.
Windows, macOS, Android, iOS	Android
One client for Subsonic, Navidrome, Jellyfin, Emby, Plex and Audio Station Runs on Android, iOS, macOS and Windows	Works with Navidrome, Ampache, gonic and other OpenSubsonic servers Multiple server support
Not open source No Linux version	Needs a compatible music server you run or have access to Android only
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
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 2, 2026	Official website Full listing and sources Checked October 2, 2026

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