A yes or no wheel is either the most useful thing on this site or the least, depending entirely on what you ask it. It has no view on the matter. It picks one of two answers with the browser's cryptographic random number generator, shows you which, and forgets it immediately.
Should you do what it says?
Almost certainly not, and that is not what it is for.
The useful part of asking a wheel is the half-second after it lands, before you have decided what to think about the answer. If it says No and you feel relieved, you did not want to. If it says No and you immediately reach to spin again, you did — and you have just found that out for the price of one spin, which is faster than most decision-making processes manage.
Which is the honest case for a wheel with only two slices on it. A decision genuinely worth agonising over should not be handed to a random number generator. A decision not worth agonising over is one you can stop agonising over. The wheel is a quick way of working out which of the two you are holding.
Is it really fifty-fifty?
Yes, and you can see that it is. Each slice takes exactly half the circle because it has exactly half the chance, which is the rule the whole site is built on: the picture is never allowed to disagree with the odds.
That also means you can lean on it, but only in the open. Type 70 against Yes in the editor and the wheel redraws with Yes taking 70% of the circle, so anyone watching can see exactly what you did. There is no setting anywhere that stacks the odds behind slices drawn the same size. If you want this wheel to agree with you, you have to be visibly seen wanting it — and noticing that you want it to is usually the answer you came for.
Why isn't Yes green and No red?
Because a lot of people cannot tell those two apart. Green for yes and red for no is the obvious pair for this wheel, and it is the one pair this site never uses anywhere: around 8% of men of European ancestry have some form of red-green colour deficiency, as do between 4% and 6.5% of men of Chinese and Japanese ancestry. So this wheel is black and white instead. Every other pair was arbitrary — nothing makes amber mean yes — and black and white is the plainest statement a two-way choice has, carries no accidental meaning, and is the one pair no projector can crush. The labels carry the meaning regardless. Colour is the second channel on this site and never the only one.
Source: Jennifer Birch, “Worldwide prevalence of red-green color deficiency”, Journal of the Optical Society of America A 29(3), 2012, 313–320.
It does not have to say Yes and No
The editor below takes any list. Two options, ten options, a question in the title field, weights that are not even — it is the same wheel underneath, and whatever you build travels in the link, so it can be shared by copying the address. The full wheel, with the whole argument for why the slices are drawn the size they are, is at truewedge.app.
Status
TrueWedge is being built. The wheel spins, the odds are honest, and the result is chosen before it turns; the colours and the layout are still provisional.