What does HackerNews think of guesstimate-app?

Create Fermi Estimates and Perform Monte Carlo Estimates

Language: JavaScript

Addendum 1: I found an (open source! [1]) app that I think does a better job of explaining the underlying model and showing how it works, maybe it could work as inspiration? (or at least to compare/contrast).

Addendum 2: My preference would be a DSL to describe this kinds of problems, rather than a drag-and-drop, GUI interface. Advanced users could do away with the mouse completely, or even run the models from the command line or embedded in another app. Any given "fixed GUI" will always have limitations, but if you want to make it easier for non-power-users, you can also build a simple GUI on top of the DSL.

1: https://github.com/getguesstimate/guesstimate-app