Binary decision with mathematical SHA-256 proof. No signup, unlimited.
Flipping a coin is one of the oldest ways to make binary decisions. The advantage of SorteiGram's online coin flip: public auditability. Each flip generates a SHA-256 hash that mathematically proves the result wasn't manipulated.
We use crypto.getRandomValues — the cryptographically secure RNG used by banks, audited casinos, and cryptographic protocols. Heads probability is exactly 50%, same as Tails.
Click 'Flip Coin' — the system generates a cryptographically secure random value using crypto.getRandomValues. 50% heads, 50% tails, with public SHA-256 hash.
Yes. Uses Web Crypto API — same function used by banks and audited casinos. Statistical distribution identical to a balanced coin.
Yes, unlimited. Choose 1, 3, 5, or 10 flips. System shows each individual result + cumulative count.
Publish SHA-256 hash in Stories before flipping. After result, seed is revealed. Anyone verifies mathematically.
Yes, 100% responsive. Works on any modern browser without app install.
Binary decisions: who pays? Which team starts? Open the gift or wait? Yes or no? All with mathematical proof.