Well it's an excel add-in, how else would it work?
Excel add-ins can be written with the Office JS API so that they can run on web as well as desktop for Windows and Mac. But I don't think OP's add-in is possible with that API unless the local model can be run in JS.
alt Hacker News
Excel add-ins can be written with the Office JS API so that they can run on web as well as desktop for Windows and Mac. But I don't think OP's add-in is possible with that API unless the local model can be run in JS.