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Qwertone vs Surge XT: catalog facts
Qwertone	Surge XT
Free Free and open source under the GPL-3.0.	Free Free and open source.
Linux	Windows, macOS, Linux
No MIDI hardware needed Simple and lightweight	Many synthesis methods, filters and effects MPE and microtuning support
Linux only Basic synthesizer rather than a full music production tool	Large feature set takes time to learn
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License not stated
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 September 23, 2026

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