Compare software

opus-tools vs qaac: catalog facts
opus-tools	qaac
Free Free and open source.	Free Free to download, with source published on GitHub.
Windows, Command line	Windows, Command line
Encode, inspect and decode Opus in one toolset Easy to script for batch conversion	Uses Apple's AAC encoder on Windows Encodes both AAC and ALAC
Command-line only, with no graphical interface Handles Opus files only	Command line only, no graphical interface Windows only
Downloadable app	Downloadable app
Open source	Open source
License: BSD-2-Clause AND GPL-2.0-only	License: Public Domain
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 2, 2026

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