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mpg123 vs SoX: catalog facts
mpg123	SoX
Free Free software under the LGPL 2.1.	Free Free and open source under GPL-2.0 and LGPL licences.
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Command line
Lightweight console MP3 playback Runtime-selected assembly optimizations for x86, x86-64 and ARM	Converts between many audio file formats Applies effects and filters during conversion
Command-line only, no graphical interface Focused on MPEG audio rather than every audio format	Command line only, with no graphical interface Infrequent releases
Downloadable app	Downloadable app
Open source	Open source
License: LGPL-2.1-only	License: GPL-2.0-or-later AND LGPL-2.1-or-later
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.