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VMPK vs Qwertone: catalog facts
VMPK	Qwertone
Free Free and open source under the GPL 3.0 or later.	Free Free and open source under the GPL-3.0.
Windows, macOS, Linux	Linux
Play MIDI notes from the computer keyboard or mouse Displays notes arriving from other MIDI devices or players	No MIDI hardware needed Simple and lightweight
Produces no sound on its own; needs a synthesizer Requires some understanding of MIDI ports and connections	Linux only Basic synthesizer rather than a full music production tool
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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