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OuterTune vs Harmony Music: catalog facts
OuterTune	Harmony Music
Free Free and open source under the GPL-3.0 licence.	Free Free to download and use.
Android	Windows, Linux, Android
Local files and YouTube Music in one player Song downloads for offline playback	No login or Google account needed No ads while streaming
Unofficial YouTube Music client that can break when the service changes Android only	Depends on YouTube Music, which can break unofficial clients Not available in the official Google Play store
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0-or-later	License not stated
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.