This coin flip streak simulator flips up to 1,000 coins at once and reports the totals plus the longest streak — the longest unbroken run of the same side in a row. It is a great way to build intuition about randomness, because true random sequences contain far longer runs of heads or tails than most people expect.
How it works
The tool generates each flip with a 50/50 chance of heads or tails, building a sequence of the length you choose. It then scans that sequence once, tracking the current run length: each time a flip matches the previous one the run grows, and a different result resets it to 1. The largest run length seen is reported as the longest streak, alongside the heads and tails totals.
Example
Flip 20 coins and you might get:
H T T H H H H T T T H T H T H H T T H T
That contains a run of four heads (positions 4-7), so the longest streak is 4. With 10 heads and 10 tails the totals are even here, but the four-in-a-row run shows how clustered true randomness looks. Everything runs in your browser, so nothing is uploaded.