Yes or no wheel
Two slices, one spin, an answer. Add "Maybe" or "Ask again tomorrow" to the box if a straight coin flip is too blunt for whatever you are deciding — every line you add becomes another slice.
The thing a decision wheel is actually for
Spinning for a yes or no is rarely about outsourcing the decision, and treating it that way misses what makes it useful. The reliable effect is that the moment the wheel starts turning, you notice which answer you were hoping for. That is the information you came for, and it arrives before the wheel stops.
So the honest instruction is: spin, notice your reaction, and then decide. If the result lands on "No" and you feel relief, that was the answer already. If it lands on "No" and you immediately want to spin again, that is also the answer, and you should take it rather than spin again.
Where a wheel does genuinely decide is for choices that do not matter and are eating time anyway — which of two equally good restaurants, which task to start first, who goes first in a game. Randomising those is not indecision, it is refusing to spend attention on something with no wrong answer.
Making it more than a coin flip
Two entries give an exact fifty-fifty. Adding a third line — "Maybe", "Ask again later", "Do the smaller version first" — changes it to a third each, which is often a more useful shape for a real question, because most real questions have an answer that is neither yes nor no.
Weights let you tilt it on purpose. Yes:2 against No gives two-thirds yes, and putting that in writing before you spin is a much more interesting exercise than it sounds: choosing the weights forces you to state how much you were already leaning, which is usually the thing you were avoiding.
What the wheel cannot do is be unfair by accident. Two entries are exactly half each, to the degree your browser's random generator is uniform, and the wheel is drawn from the same numbers that choose the winner. There is no thumb on the scale unless you put one there with a weight.
Common questions
Is the yes or no wheel really 50/50?
With two entries, yes. Each takes exactly half the circle and the winner is chosen from a uniform random number before the wheel spins to match it. Adding a weight, or a third option, changes the odds and shows that change on the wheel.
Can I add options besides yes and no?
Yes. Every line in the box becomes a slice, so you can add Maybe, Ask again tomorrow, or any set of options you like. The wheel redraws as you type.
Should I use a wheel to make an important decision?
No. Use it for decisions where either answer is fine and the deliberation is costing more than the choice is worth. For anything that matters, the useful part is noticing which result you hoped for while it was still spinning.