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Retro Music Player vs Opus 1 Music Player: catalog facts
Retro Music Player	Opus 1 Music Player
Free Free and open source under the GPL 3.0.	Free Free and open source under the GPL-3.0-only license.
Android	Android
Many themes and now playing layouts Gapless and crossfade playback	Organizes works and movements using music metadata Provides views by composer, performer, genre, and folder
Android only Plays local files only, no streaming services	Designed for Android
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
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 8, 2026

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