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