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VMPK for Android vs Midistrum: catalog facts
VMPK for Android	Midistrum
Free Free and open source under GPL-3.0-or-later.	Free Free and open source under the GPL-3.0 license.
Android	Android
Includes a software MIDI synthesizer Can send MIDI events over the local network	Sends MIDI using Android's native MIDI system Can send MIDI to a synth or a computer over USB
Android only Does not record, edit or play back MIDI compositions	Does not generate sound without a separate synthesizer
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0
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 8, 2026

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