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Ultrasonic vs DSub2000: catalog facts
Ultrasonic	DSub2000
Free Free and open source under the GPL-3.0.	Free Free and open source under the GPL-3.0 licence.
Android	Android
Works with Navidrome, Ampache, gonic and other OpenSubsonic servers Multiple server support	Caches songs for offline playback Reduces mobile data use when streaming
Needs a compatible music server you run or have access to Android only	Requires a Subsonic-compatible 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	Not stated if an account is needed
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.