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FabFilter One vs Surge XT: catalog facts
FabFilter One	Surge XT
Paid Paid plug-in with a 30-day trial.	Free Free and open source.
Windows, macOS	Windows, macOS, Linux
Warm self-oscillating filter Aliasing-free oscillator with pulse width modulation	Many synthesis methods, filters and effects MPE and microtuning support
Single oscillator design limits sound range Needs a host application such as a DAW	Large feature set takes time to learn
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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