That web version is very neat. Solvespace is by far my favorite cad, it ls hard to explain exactly why because it really is quite limited compared to other cad packages, but I think it is mainly because of the fluidity and shear joy of operation while expressing constraints.

One of these days I need to dive into the code and figure out a replacement for the modal "can not create constraint" dialogs as those are the worst part of the whole experience.