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Accordion vs Melodeon: catalog facts
Accordion	Melodeon
Free Free and open source, distributed through F-Droid.	Free Free and open source, distributed through F-Droid.
Android	Android
Diatonic and chromatic layouts with many keys Choice of MIDI instruments and fascia images	Melodeon and organetto layouts with reversible buttons Seven keys and the full standard MIDI instrument set
Infrequent updates, last code change in early 2024 Assumes you already know how to play button accordion	Designed for tablets rather than phones Relies on an undocumented Android MIDI interface
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	No account needed
Not stated if it 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.