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OuterTune vs SimpMusic: catalog facts
OuterTune	SimpMusic
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the GPL-3.0 licence.
Android	Android
Local files and YouTube Music in one player Song downloads for offline playback	Ad-free background playback of YouTube Music Browse charts, podcasts and moods and genres
Unofficial YouTube Music client that can break when the service changes Android only	Unofficial client that depends on YouTube Music data May break when YouTube changes its service
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0-only
Not stated if an account is needed	Not stated if an account is 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.