Coin Flip Streak
Flip a coin and track your streak of results.
Flipping, with a record
This flips a coin and keeps track of the results over many flips, showing your streaks and the running tally of heads and tails. It is fun for games, and a nice window into how randomness actually behaves.
Flip repeatedly and watch the streaks build.
What streaks reveal about randomness
Tracking many coin flips reveals something genuinely interesting and often surprising about randomness: streaks of the same result are far more common than people expect. Our intuition says a fair coin should alternate fairly evenly, so a run of several heads in a row feels like it must be unusual or that the coin is due to land tails — but in truth, over many flips, long streaks are entirely normal and expected, and each flip remains an independent fifty-fifty regardless of what came before. This is the famous gambler's fallacy: the mistaken belief that past results influence future ones, when a fair coin has no memory. Watching real streaks build is a vivid, hands-on lesson in this, showing that genuine randomness looks streakier and less evenly mixed than we imagine. Beyond the insight, tracking streaks is fun for games and for seeing how the totals even out over a large number of flips, gradually approaching the expected fifty-fifty even as short runs stay wildly uneven. It is a small tool that quietly teaches a genuinely important truth about chance.
Common questions
Are long streaks of heads or tails unusual?
No — over many flips, long streaks are entirely normal and expected, even though our intuition says a fair coin should alternate more evenly.
What is the gambler's fallacy?
The mistaken belief that past results influence future ones — a fair coin has no memory, so it is never 'due' for the other result after a streak.
Is anything uploaded?
No. It runs entirely in your browser.