Why "Calculator" Is Such an Effective Word
It implies determinism. A calculator does not guess — it computes, and the answer is the answer. Applying that framing to a random draw imports all of the authority and none of the applicability, which is precisely why the word appears in this category rather than "guesser" or "suggester".
The tell is what the interface asks for. A genuine calculator needs every variable in its formula; a prediction calculator asks for a period number and nothing else, because there is no formula behind the button and the input exists to make the page feel connected to your round.
What a Real Probability Tool Would Say
It would report that each side has an even chance, that the payout is below even money, and that the expected value of any bet is therefore slightly negative. It would say the same thing before every round, forever, regardless of history. That is a correct tool and an unsellable one, which is why the category is full of the other kind.
For the market overview and what each kind of product costs, see the home page. Related reading: online tool entry.