Coin Flip

Is it actually fair?

Yes. We use crypto.getRandomValues() — your browser's cryptographically-secure RNG. Each flip is independent and exactly 50/50. Unlike a real coin (where a small bias exists from the side you start on and how hard you flip), this is truly even — every flip has exactly 50% probability regardless of what came before.

"But the last 10 were heads"

Yes, and the next one is still 50/50. This is the gambler's fallacy — the belief that a coin is "due" for the other side after a streak. It isn't. Coins have no memory. After 10 heads in a row, the chance of an 11th heads is still exactly 0.5. Streaks happen. In 20 flips you'd expect to see a streak of 4 or more about 50% of the time by pure chance.

When NOT to use a coin flip

• Major life decisions. If you're flipping a coin on whether to take the job, you already know the answer — pay attention to how you feel when the coin is in the air, not the result.
• Weighted choices. If one option is clearly better, don't leave it to 50/50 — a coin flip is for choices where both options are genuinely equivalent.
• Legal/binding outcomes. Most jurisdictions require hardware RNGs or observable physical randomisation for legally-binding draws.

Session history

The last 20 flips are kept below so you can look back through your streak. History clears when you close the tab or hit "Clear." Nothing is stored on our server.