There's more to it. Stan does models, as akin to statistical models. Workflow: specify model - run - evaluate results. Within that sphere they f.e. don't suppor

There's more to it. Stan does models, as akin to statistical models. Workflow: specify model - run - evaluate results. Within that sphere they f.e. don't support all types of variables, but are fast, well-documented and under active development. Outside of that sphere there is even more: you can make any program probabilistic / learning with something like PyMC that embed PP in a regular environment. Think bots, agents, UIs ...