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Midistrum vs VMPK for Android: catalog facts
Midistrum	VMPK for Android
Best for: Android musicians who want an omnichord-style MIDI controller	Best for: Android users who need a portable MIDI controller keyboard
Free Free and open source under the GPL-3.0 license.	Free Free and open source under GPL-3.0-or-later.
Android	Android
Sends MIDI using Android's native MIDI system Can send MIDI to a synth or a computer over USB	Includes a software MIDI synthesizer Can send MIDI events over the local network All 3 strengths for VMPK for Android Includes a software MIDI synthesizer Can send MIDI events over the local network Supports adjustable keyboard size and simultaneous touches
Does not generate sound without a separate synthesizer	Android only Does not record, edit or play back MIDI compositions
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0-or-later
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 Sources for Midistrum github.com/guysoft/midistrum Catalog checked October 8, 2026	Official website Full listing and sources Sources for VMPK for Android pedrolcl.github.io/vmpk-android Catalog checked October 8, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.