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Caldera Amp vs Symfonium: catalog facts
Caldera Amp	Symfonium
Free Downloads are offered without a listed price; a Plex music server is needed.	Paid One-time purchase with a free trial on Google Play; no subscription.
Windows, macOS, Linux	Android
Built-in MilkDrop visualizer in its own window Plays lossless formats up to 24-bit/384 kHz	Connects to many self-hosted media servers Hi-Res, DSD and USB DAC output with AutoEQ
Only works with Plex music servers Driven from Plexamp rather than a full library window	Android only Paid after the trial
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
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 September 23, 2026

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