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Opus 1 Music Player vs Musicolet: catalog facts
Opus 1 Music Player	Musicolet
Free Free and open source under the GPL-3.0-only license.	Free Free to download with no ads.
Android	Android
Organizes works and movements using music metadata Provides views by composer, performer, genre, and folder	No internet permission and no ads Multiple playback queues
Designed for Android	Plays local files only, no streaming or server support Android only
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0-only	License not stated
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 8, 2026	Official website Full listing and sources Checked September 23, 2026

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