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Accordion vs Hexpress: catalog facts
Accordion	Hexpress
Free Free and open source, distributed through F-Droid.	Free Free and open source under the Unlicense.
Android	Android
Diatonic and chromatic layouts with many keys Choice of MIDI instruments and fascia images	Touchscreen instrument for musical experiments Includes chord, drum, fretboard and sampler tools
Infrequent updates, last code change in early 2024 Assumes you already know how to play button accordion	Android only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-only	License: Unlicense
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 2, 2026	Official website Full listing and sources Checked October 8, 2026

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