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SimpMusic vs OpenTune: catalog facts
SimpMusic	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
Ad-free background playback of YouTube Music Browse charts, podcasts and moods and genres	Ad-free and background playback Offline downloads and synchronized lyrics
Unofficial client that depends on YouTube Music data May break when YouTube changes its service	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-only	License: GPL-3.0-or-later
Not stated if an account is needed	No account 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.