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OuterTune vs Azusa Player Mobile: catalog facts
OuterTune	Azusa Player Mobile
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the AGPL-3.0 licence.
Android	Android
Local files and YouTube Music in one player Song downloads for offline playback	Plays Bilibili and YouTube audio alongside local files Playlist sync with the Azusa Player extension
Unofficial YouTube Music client that can break when the service changes Android only	Documentation is mostly in Chinese Depends on third-party platforms that may change
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: AGPL-3.0
Not stated if an account is needed	No account needed
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 2, 2026

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