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Azul Box vs Parabolic: catalog facts
Azul Box	Parabolic
Free Free and open source under the GPL-3.0.	Free Free and open source under the MIT licence.
Linux	Windows, macOS, Linux, Browser extension
Graphical front end for yt-dlp and ffmpeg MusicBrainz metadata for downloaded music	A real desktop interface for yt-dlp, covering hundreds of supported sites Downloads in MP4, WebM, MP3, Opus, FLAC and WAV
Linux only Small single-developer project	The authors note that content may be DMCA protected and disclaim responsibility for unlawful use It inherits yt-dlp's breakages when a site changes
Downloadable app	Downloadable app, Browser extension
Open source	Open source
License: GPL-3.0-only	License: MIT
No account needed	No account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 21, 2026

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