Yes or No Wheel
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Press Spin and the wheel lands on Yes, No or Maybe. By default Yes and No each have a 50 percent chance, and you can change the odds. The answer is chosen with your browser’s cryptographic random generator before the wheel turns.
Your question and odds
Spin history
No spins yet. Press Spin to start your history.
What are the odds?
This table shows, for your current settings, the chance of each answer on one spin, the chance of getting the same answer twice, three times and five times in a row, and the chance of seeing it at least once in three spins.
| Answer | One spin | 2 in a row | 3 in a row | 5 in a row | At least once in 3 spins |
|---|---|---|---|---|---|
| Yes | 50% | 25.00% | 12.50% | 3.125% | 87.5% |
| No | 50% | 25.00% | 12.50% | 3.125% | 87.5% |
In a row means p multiplied by itself that many times, because spins are independent. At least once in 3 spins is 1 minus (1 minus p) to the third power.
Does it behave like the math says?
Simulate many spins with your odds and compare the counts with what probability predicts. Each count should land within about two standard deviations of the expected number, where the standard deviation of a count is the square root of n times p times (1 minus p).
Example: 100 simulated spins (fixed seed). The last column says how many standard deviations each count is from the expected number. About 95 percent of the time it lands between -2 and +2.
| Answer | Count | Share | Odds | Usual range | Std. devs |
|---|---|---|---|---|---|
| Yes | 48 | 48.00% | 50.00% | 40 to 60 | -0.40 |
| No | 52 | 52.00% | 50.00% | 40 to 60 | +0.40 |
The more spins you run, the closer the share gets to the odds, but the raw difference in counts can still grow. That is the law of large numbers: the share settles down, not the exact count.
How it works
The wheel draws a random number between 0 and 1 from your browser’s cryptographic generator. If the number falls in the Yes part of the range, the answer is Yes, and so on. A second random number picks where in that answer’s slices the pointer stops, then the wheel turns to that angle. Yes and No are spread over repeating slices only to look like a wheel, and the total area of each answer equals its odds.
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Common questions
Is the yes or no wheel really random?
Yes. When you press Spin, your browser picks the answer first using its cryptographic random number generator, the same source used for security keys. The wheel then turns to show that answer, so the animation can never change the result.
Can I change the odds?
Yes. Type any odds you like for Yes, No and Maybe. They are scaled to add up to 100 percent, and the slices on the wheel are sized to match, so what you see is what you get. Setting Maybe to 0 removes it from the wheel.
Why do I sometimes get the same answer several times in a row?
That is normal. With even odds, the chance of the same answer twice in a row is 25 percent, three times in a row is 12.5 percent, and five in a row is about 3 percent. The odds table on this page works these out for your settings.
Does the wheel have a memory?
No. Every spin is independent. After five Yes answers in a row, the next spin is still the same chance as the first. Believing otherwise is called the gambler’s fallacy.
Can I rely on it for big decisions?
It is good for small choices, games and breaking ties. For decisions that matter, use it as a nudge: if you feel disappointed by the answer, that tells you something about what you want.
Can I turn the sound on?
Yes. Sound is off by default. Press the sound button for a tick as the wheel turns and a short chime when it stops.
Is anything sent to a server?
No. The wheel runs in your browser and your question stays on your device.
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