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rsgain vs iVolume: catalog facts
rsgain	iVolume
Free Free and open source under the BSD 2-Clause licence.	Paid Paid license, sold directly and on the Mac App Store.
Windows, macOS, Linux, Android, Command line	Windows, macOS
Easy Mode tags a whole library with one command Supports ReplayGain 2.0 track and album gain	Uses Replay Gain to estimate perceived loudness Works with Apple Music and iTunes libraries on Mac and Windows
Command line only, no graphical interface Only writes tags; playback volume depends on player support	Tied to Apple Music or iTunes libraries Paid software
Downloadable app	Downloadable app
Open source	Closed source
License: BSD-2-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 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.