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Opus 1 Music Player vs Retro Music Player: catalog facts
Opus 1 Music Player	Retro Music Player
Free Free and open source under the GPL-3.0-only license.	Free Free and open source under the GPL 3.0.
Android	Android
Organizes works and movements using music metadata Provides views by composer, performer, genre, and folder	Many themes and now playing layouts Gapless and crossfade playback
Designed for Android	Android only Plays local files only, no streaming services
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-only	License: GPL-3.0-only
Not stated if an account is needed	Not stated if an account is 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 October 2, 2026

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