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iVolume vs rsgain: catalog facts
iVolume	rsgain
Paid Paid license, sold directly and on the Mac App Store.	Free Free and open source under the BSD 2-Clause licence.
Windows, macOS	Windows, macOS, Linux, Android, Command line
Uses Replay Gain to estimate perceived loudness Works with Apple Music and iTunes libraries on Mac and Windows	Easy Mode tags a whole library with one command Supports ReplayGain 2.0 track and album gain
Tied to Apple Music or iTunes libraries Paid software	Command line only, no graphical interface Only writes tags; playback volume depends on player support
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: BSD-2-Clause
Not stated if an account is needed	No account 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.