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OB-Xf vs Surge XT: catalog facts
OB-Xf	Surge XT
Free Free open source plugin maintained by the Surge Synth Team.	Free Free and open source.
Windows, macOS, Linux	Windows, macOS, Linux
VST3, CLAP, AU and LV2 formats Builds for Windows, macOS and Linux, including ARM Linux	Many synthesis methods, filters and effects MPE and microtuning support
Needs a compatible plugin host or DAW Recommends 8 GB of RAM or more	Large feature set takes time to learn
Downloadable app	Downloadable app
Open source	Open source
License not stated	License not stated
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 September 23, 2026

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