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Symfonium vs Ultrasonic: catalog facts
Symfonium	Ultrasonic
Paid One-time purchase with a free trial on Google Play; no subscription.	Free Free and open source under the GPL-3.0.
Android	Android
Connects to many self-hosted media servers Hi-Res, DSD and USB DAC output with AutoEQ	Works with Navidrome, Ampache, gonic and other OpenSubsonic servers Multiple server support
Android only Paid after the trial	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
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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