Flip a virtual coin for a fair fifty-fifty decision, with running totals.
Single flip
Settle one decision
1Best of three
Three flips at once
3A hundred flips
Watch the ratio settle
100One tap gives you heads or tails. There is nothing to configure.
Set a count to run a batch, useful for best-of-three or for demonstrating probability.
Running totals show how the split is developing, and the history keeps the recent sequence visible.
A cryptographic random source means each flip is genuinely independent and each outcome exactly as likely as the other.
Running a hundred flips at once takes a second and shows how slowly the ratio converges — short streaks are normal, not suspicious.
Opens instantly on a phone, which is the moment you actually need it.
A genuinely fair coin flip when you need to settle something and have no coin to hand. Each flip is drawn from the browser’s cryptographic random source, so it is not a repeating pattern dressed up as chance. Flip once or many times at once, and watch the running tally of heads and tails — which is also a quiet lesson in probability, since short runs deviate from fifty-fifty far more than most people expect.
Keep going
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Count words, characters, sentences and paragraphs as you type.
Count characters with and without spaces, against the limits that matter.
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Sample and population standard deviation and variance, both shown, with the working.
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