Coin Flip Simulator
NewFlip one or more virtual coins using cryptographically strong randomness, with a running heads/tails tally and streak-friendly multi-coin flips.
Each flip uses crypto.getRandomValues for cryptographically strong randomness rather than Math.random(), giving each coin a genuinely unbiased 50/50 chance. The running tally persists across multiple flips until you reset it.
Frequently Asked Questions
Why use crypto.getRandomValues instead of Math.random()?
Math.random() is a pseudo-random generator not designed for unpredictability guarantees, while crypto.getRandomValues draws from the operating system's cryptographically secure random number generator — ensuring each flip is genuinely unbiased with no detectable pattern.
How many coins can I flip at once?
Between 1 and 20 per flip. Flipping multiple coins at once is handy for quickly settling multi-way decisions or running a quick probability demonstration (like checking how often 10 coins land close to a 50/50 split).
Does the running tally reset automatically?
No — the heads/tails/total tally persists across every flip until you click "Reset tally," so you can track the cumulative results of a whole session rather than just the most recent flip.
Is this fair for making real decisions?
Yes — with cryptographically strong randomness, each coin has a mathematically unbiased 50% chance of either outcome, making it as fair as (or fairer than, given human bias in physical coin flips) an actual coin toss.
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