An XCas question....

[DrD]

I think Wolfram Alpha Pro is interactive from Wolfram's Mathematica, but I don't use either of them. Sometimes I do use the free online Alpha product, but I also do use wxMaxima, also free. For us seniors, justifying the very expensive products when there are so many other things chasing disposable income, doesn't rise very high on the list.

I've heard that Wolfram Alpha, "isn't God." So maybe there will be an open source, freely available, CAS product someday, that will become the gold standard among the pack. As online educational tools begin to proliferate, it seems likely this will emerge. Still, Wolfram Alpha IS useful to contrast other results from similar products, especially when results need confirmation.