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Ultrasonic vs Power Ampache 2: catalog facts
Ultrasonic	Power Ampache 2
Free Free and open source under the GPL-3.0.	Free Free and open source under the GPL-3.0 license.
Android	Android
Works with Navidrome, Ampache, gonic and other OpenSubsonic servers Multiple server support	Works with Ampache, Nextcloud Music and compatible backends Downloads can be exported as ordinary files
Needs a compatible music server you run or have access to Android only	Requires your own compatible music server Android only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
Not stated if an account is needed	Account needed
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 2, 2026

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