Coin Flip
Heads or tails — settle it fairly.
A virtual coin flip for decisions, kickoffs and tie-breakers — using cryptographic randomness, fairer than most real coins.
How to use
- Click "Flip the coin".
- Watch the animation — heads or tails is revealed.
- Running tallies track your session.
About this tool
Session tallies let you run best-of series.
Nothing is recorded or uploaded.
How it works
A coin flip is the classic 50/50 Bernoulli trial: two outcomes, each with probability 0.5, independent of every previous flip. The tool uses the browser's cryptographic random source, so streaks are just probability at work — five heads in a row happens about 3% of the time.
Humans are bad at producing or judging randomness: we expect alternation and distrust streaks. When a decision needs to be fair, a real random flip beats picking "in your head" every time.
Worked examples
Settle it: Cannot agree on who goes first? One flip, best of one, done.
Teach probability: Flip 100 times and watch the heads ratio converge toward 50% — the law of large numbers in action.
Frequently asked questions
Is it really 50/50?
Yes — it uses crypto.getRandomValues, a cryptographically secure random source.
Can I use it to make decisions?
For fun decisions, absolutely. For anything serious, flip three times.
Is anything tracked?
No.
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