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SoX vs Switch Audio File Converter: catalog facts
SoX	Switch Audio File Converter
Free Free and open source under GPL-2.0 and LGPL licences.	Freemium Free for non-commercial use; commercial use requires a paid licence.
Windows, macOS, Linux, Command line	Windows, macOS, Android
Converts between many audio file formats Applies effects and filters during conversion	Batch conversion of many files at once Wide range of input and output formats, including dictation formats
Command line only, with no graphical interface Infrequent releases	Free version limited to non-commercial use Closed source
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0-or-later AND LGPL-2.1-or-later	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 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.