How is the longest streak counted?

A streak is the longest unbroken run of the same side in a row — for example HHHH is a streak of four heads. The tool scans the whole sequence and reports the longest run it finds.

Are the flips truly random?

Each flip uses your browser's built-in random number generator with a 50/50 chance of heads or tails, so results are independent and unbiased for casual use.

Is anything sent to a server?

No. Every flip is generated locally in your browser and nothing leaves your device.

Coin Flip Streak Simulator

Flip many coins at once and see the longest run of heads or tails.

Coin flip streak simulator

Flip up to 1000 coins at once and instantly see how they fall: the total heads and tails, and the longest streak of the same side in a row.

It is a quick way to build intuition about randomness — long runs of heads or tails happen far more often than people expect. Everything runs in your browser, so nothing is uploaded.