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SoX vs SoundConverter: catalog facts
SoX	SoundConverter
Free Free and open source under GPL-2.0 and LGPL licences.	Free Free and open source under the GPL-3.0 licence.
Windows, macOS, Linux, Command line	Linux
Converts between many audio file formats Applies effects and filters during conversion	Reads anything GStreamer supports Multithreaded batch conversion
Command line only, with no graphical interface Infrequent releases	Linux and GNOME focused MP3 output depends on the GStreamer LAME plugin
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0-or-later AND LGPL-2.1-or-later	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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