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YTMDesktop vs Harmony Music: catalog facts
YTMDesktop	Harmony Music
Free Free and open source under the GPL-3.0 licence; YouTube Music's own subscription terms…	Free Free to download and use.
Linux	Windows, Linux, Android
Runs YouTube Music as a standalone desktop app Free and open source	No login or Google account needed No ads while streaming
Unofficial, so changes to YouTube Music can break it Depends on the YouTube Music web service	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	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.