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Surge XT vs Qwertone: catalog facts
Surge XT	Qwertone
Free Free and open source.	Free Free and open source under the GPL-3.0.
Windows, macOS, Linux	Linux
Many synthesis methods, filters and effects MPE and microtuning support	No MIDI hardware needed Simple and lightweight
Large feature set takes time to learn	Linux only Basic synthesizer rather than a full music production tool
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

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