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Melodeon vs Accordion: catalog facts
Melodeon	Accordion
Free Free and open source, distributed through F-Droid.	Free Free and open source, distributed through F-Droid.
Android	Android
Melodeon and organetto layouts with reversible buttons Seven keys and the full standard MIDI instrument set	Diatonic and chromatic layouts with many keys Choice of MIDI instruments and fascia images
Designed for tablets rather than phones Relies on an undocumented Android MIDI interface	Infrequent updates, last code change in early 2024 Assumes you already know how to play button accordion
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-only	License: GPL-3.0-only
No account 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 2, 2026

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