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OuterTune vs OpenTune: catalog facts
OuterTune	OpenTune
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the GPL-3.0-or-later licence.
Android	Android
Local files and YouTube Music in one player Song downloads for offline playback	Ad-free and background playback Offline downloads and synchronized lyrics
Unofficial YouTube Music client that can break when the service changes Android only	Unofficial client that depends on YouTube Music and can break when it changes Android only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0-or-later
Not stated if an account is needed	No account needed
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.