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