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MuseAmp vs iVolume: catalog facts
MuseAmp	iVolume
Free Free and open source under the BSD-3-Clause licence.	Paid Paid license, sold directly and on the Mac App Store.
Linux	Windows, macOS
Single-purpose tool for volume normalization Graphical interface instead of command-line tools	Uses Replay Gain to estimate perceived loudness Works with Apple Music and iTunes libraries on Mac and Windows
Linux only Small project with limited documentation	Tied to Apple Music or iTunes libraries Paid software
Downloadable app	Downloadable app
Open source	Closed source
License: BSD-3-Clause	License not stated
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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