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Azul Box vs 4K YouTube to MP3: catalog facts
Azul Box	4K YouTube to MP3
Free Free and open source under the GPL-3.0.	Freemium Free to download and use, with paid Lite and Personal plans for extra features.
Linux	Windows, macOS, Linux
Graphical front end for yt-dlp and ffmpeg MusicBrainz metadata for downloaded music	Downloads whole playlists and channels as audio Supports many sites beyond YouTube
Linux only Small single-developer project	Some features require a paid plan Higher-quality YouTube audio requires a YouTube Premium membership
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0-only	License not stated
No account needed	No account needed
Not stated if it works offline	Not stated if it 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.