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