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Azul Box vs Downtify: catalog facts
Azul Box	Downtify
Free Free and open source under the GPL-3.0.	Free Free and open source under the GPL-3.0 licence.
Linux	Web, Self-hosted
Graphical front end for yt-dlp and ffmpeg MusicBrainz metadata for downloaded music	No Spotify credentials or API keys needed Five output formats with full tags, cover art and lyrics
Linux only Small single-developer project	Audio comes from YouTube Music matches, not from Spotify itself Matches can occasionally pick the wrong recording
Downloadable app	Self-hosted
Open source	Open source
License: GPL-3.0-only	License: GPL-3.0
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 2, 2026

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