How to use it
- Press Flip. The coin turns over and settles on one side.
- The result appears in large type: Heads or Tails. Counters below track the series.
- Clear the score resets the counters and starts a fresh series.
How the side is decided
Before the coin finishes turning, the outcome is already chosen; the animation only shows a result that exists. The choice comes from the browser cryptographic random generator, crypto.getRandomValues, not from Math.random, and the draw is rejection-sampled so both sides get exactly even odds. No bias, and no memory of earlier flips.
A real coin is slightly unfair, as it happens: it lands a little more often on the face that started upward, and a thumb flip has a measurable bias of about one percent. A virtual coin has neither a centre of gravity nor a habit, so for settling an argument it is the fairer of the two.
When a coin beats an argument
- Who does the dishes, who goes to the shop, who pays for the coffee.
- A choice between two options you genuinely rate the same.
- Who moves first in a board game.
Questions
How do I flip a coin online?
Press the Flip button on this page. The coin turns over in 3D and settles on heads or tails, and the result appears in large type. Nothing to install.
Is it really fifty-fifty?
Yes. The side is picked by the cryptographic random generator in your browser with a uniform distribution, so heads and tails have identical odds. Previous flips have no effect — the coin has no memory.
Can I keep score?
The counters under the coin track heads, tails and total tosses. Clear the score whenever you want to start a new series.
Does anything about my flips get sent anywhere?
No. The outcome is computed in the tab; neither the result nor the score reaches affpapa.org. Reload the page and the score is gone, because nothing is stored.
