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If not Electron, is it native or does it use some other web engine?

It uses the authors' own Revery [0] framework, based on ReasonML and GLFW. So there's Javascript in the stack, but no Chromium.

[0] https://github.com/revery-ui/revery

ReasonML does not imply JavaScript - it can compile natively using the OCaml native compilers - and that's exactly what Revery does. GLFW is also native/C.

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