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Retro Music Player vs Kasette: catalog facts
Retro Music Player	Kasette
Free Free and open source under the GPL 3.0.	Free Free and open source under the BSD-3-Clause licence.
Android	Android, Web
Many themes and now playing layouts Gapless and crossfade playback	No network access, accounts or analytics Plays common formats including FLAC and Opus
Android only Plays local files only, no streaming services	Very new project with few users Only plays files you import yourself
Downloadable app	Downloadable app, Web application
Open source	Open source
License: GPL-3.0-only	License: BSD-3-Clause
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.