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OB-Xf vs ZynAddSubFX: catalog facts
OB-Xf	ZynAddSubFX
Free Free open source plugin maintained by the Surge Synth Team.	Freemium Source code is free; the Zyn-Fusion binary release is pay what you want from $45.
Windows, macOS, Linux	Windows, macOS, Linux
VST3, CLAP, AU and LV2 formats Builds for Windows, macOS and Linux, including ARM Linux	Three synthesis engines including PAD synthesis Wide choice of filters and free-form envelopes
Needs a compatible plugin host or DAW Recommends 8 GB of RAM or more	Ready-made Zyn-Fusion binaries are paid Deep parameter set takes time to learn
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-2.0
Not stated if an account is needed	No account needed
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.