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qaac vs SoX: catalog facts
qaac	SoX
Free Free to download, with source published on GitHub.	Free Free and open source under GPL-2.0 and LGPL licences.
Windows, Command line	Windows, macOS, Linux, Command line
Uses Apple's AAC encoder on Windows Encodes both AAC and ALAC	Converts between many audio file formats Applies effects and filters during conversion
Command line only, no graphical interface Windows only	Command line only, with no graphical interface Infrequent releases
Downloadable app	Downloadable app
Open source	Open source
License: Public Domain	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 2, 2026	Official website Full listing and sources Checked October 1, 2026

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