← Full Random Number Generator (choose quantum, earthquake, or sensor-based entropy)
A real online coin flip, generated from genuine physical entropy — not a fake animation.
Most online coin flippers just call Math.random() in your browser. This one is different: every flip calls a live API that pulls entropy from a real physical process (by default, nanosecond-scale timing noise from the server's own CPU), mixes it cryptographically, and maps it to heads or tails using rejection sampling — a technique that guarantees neither side is even slightly more likely than the other. If you want to see exactly how a given flip was generated, or pick a different entropy source such as live earthquake data or quantum vacuum noise, try the full random number generator.
Yes. Each flip is generated from real physical entropy, mixed with a cryptographic hash, giving heads and tails exactly equal probability.
Exactly 50/50. The rejection-sampling method used guarantees neither side is favored, unlike naive modulo-based methods which can introduce tiny biases.
Yes — the full random number generator shows a complete technical breakdown of the raw entropy, the mixing step, and the exact mapping calculation for every result.