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Retro Music Player vs MonsterMusic: catalog facts
Retro Music Player	MonsterMusic
Free Free and open source under the GPL 3.0.	Free Free and open source under the Apache 2.0 licence.
Android	Android
Many themes and now playing layouts Gapless and crossfade playback	Plays local files without a streaming account Built-in advanced equalizer
Android only Plays local files only, no streaming services	Android only No releases published on GitHub; installed through F-Droid or by building it
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-only	License: Apache-2.0
Not stated if an account is needed	No account needed
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.