Coin Flip
Cryptographically fair — press Space or tap to flip
Tap the coin or press Space
How to use Coin Flip
- Single flip— tap the coin, click “Flip Coin”, or press Space to flip once.
- Batch flip— click “Flip 10×” to flip ten coins at once and see a distribution bar.
- Session stats— a running tally and streak counter appear after your first flip, along with history dots.
- Reset— click “Reset” to clear all stats and start fresh.
When to use Coin Flip
- Quick decisions— can't choose between two options? Let the coin decide in under a second.
- Sports and games— fair toss to determine who goes first, picks sides, or starts a game.
- Classroom activities— probability experiments, statistics lessons, or random team assignment.
- Probability experiments— use “Flip 10×” repeatedly to observe how outcomes approach 50/50 over many trials.
- Resolving disputes— an impartial, cryptographically fair arbiter when neither party can agree.
FAQ
Is this coin flip truly fair?
Yes. Every flip uses crypto.getRandomValues()— the same cryptographically secure random number generator used in password managers and encryption software. There is no bias toward heads or tails.
Why do I sometimes get many heads or tails in a row?
Streaks are normal in genuinely random sequences. If you flip a fair coin 10 times, there is roughly a 1-in-4 chance of getting a run of 4 or more in a row. True randomness doesn't “even out” each flip — each toss is always 50/50 regardless of history.
Can I use keyboard shortcuts?
Yes — press Space anywhere on the page to flip the coin instantly.