Coin Flip
Flip a coin once for a decision, or thousands of times to watch the proportion settle. Each flip is drawn from the browser cryptographic random number generator, so heads and tails are exactly equally likely. The tally and percentage are shown for multiple flips, which is the honest way to see fairness — a run of one result in a handful of flips is expected and proves nothing either way. Everything is generated in your browser; nothing is uploaded and no result is recorded anywhere.
How it works
Each flip is drawn from the browser’s cryptographic random number generator using rejection sampling, so every outcome is exactly equally likely. A modulo would make the low faces very slightly more common — invisible in a handful of rolls, but it is a real skew and there is no reason to accept it.
A run of the same result is not evidence of anything: with fair flips, streaks are expected and common. The tallies below are there to show the distribution over many trials rather than to prove fairness from a few.
Nothing is uploaded, and no result is recorded anywhere outside this page.
Frequently asked questions
Is the coin genuinely fair?
Yes — each flip comes from the browser cryptographic random number generator and the two outcomes are exactly equally likely. There is no weighting and no memory of previous flips.
I got six heads in a row. Is something wrong?
No. With a fair coin, six heads in a row happens about once in every sixty-four sequences of six — which means it happens often. Streaks feel significant and are not; the coin has no memory of what came before.
Why flip thousands of times?
Because it shows what fairness actually looks like: the proportion converges slowly on half, while individual streaks stay common throughout. It is a much better demonstration than a handful of flips.
Does the next flip become more likely to be tails after a run of heads?
No. That belief is the gambler fallacy. Each flip is independent, so the chance is one in two every time regardless of history.
Can anyone see or predict my result?
No. The flip happens in your browser, nothing is sent anywhere, and the source is a cryptographic generator with no predictable seed.
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