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Hexpress vs Accordion: catalog facts
Hexpress	Accordion
Free Free and open source under the Unlicense.	Free Free and open source, distributed through F-Droid.
Android	Android
Touchscreen instrument for musical experiments Includes chord, drum, fretboard and sampler tools	Diatonic and chromatic layouts with many keys Choice of MIDI instruments and fascia images
Android only	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: Unlicense	License: GPL-3.0-only
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 2, 2026

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