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