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FabFilter One vs ZynAddSubFX: catalog facts
FabFilter One	ZynAddSubFX
Paid Paid plug-in with a 30-day trial.	Freemium Source code is free; the Zyn-Fusion binary release is pay what you want from $45.
Windows, macOS	Windows, macOS, Linux
Warm self-oscillating filter Aliasing-free oscillator with pulse width modulation	Three synthesis engines including PAD synthesis Wide choice of filters and free-form envelopes
Single oscillator design limits sound range Needs a host application such as a DAW	Ready-made Zyn-Fusion binaries are paid Deep parameter set takes time to learn
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0
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 October 2, 2026

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