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