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