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FabFilter One vs OB-Xf: catalog facts
FabFilter One	OB-Xf
Paid Paid plug-in with a 30-day trial.	Free Free open source plugin maintained by the Surge Synth Team.
Windows, macOS	Windows, macOS, Linux
Warm self-oscillating filter Aliasing-free oscillator with pulse width modulation	VST3, CLAP, AU and LV2 formats Builds for Windows, macOS and Linux, including ARM Linux
Single oscillator design limits sound range Needs a host application such as a DAW	Needs a compatible plugin host or DAW Recommends 8 GB of RAM or more
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is 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 October 2, 2026

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