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Downtify vs Azul Box: catalog facts
Downtify	Azul Box
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the GPL-3.0.
Web, Self-hosted	Linux
No Spotify credentials or API keys needed Five output formats with full tags, cover art and lyrics	Graphical front end for yt-dlp and ffmpeg MusicBrainz metadata for downloaded music
Audio comes from YouTube Music matches, not from Spotify itself Matches can occasionally pick the wrong recording	Linux only Small single-developer project
Self-hosted	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0-only
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 2, 2026	Official website Full listing and sources Checked October 1, 2026

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