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