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ReadyPress Space or flip the coin
Decision labels
Mode options
Recent sequence
Weighted experiment
Weighted mode is for probability experiments. Your normal coin remains exactly 50/50.
Simulation result
—Heads
—Tails
—Z-score
—Deviation
Session fairness report
Random source—
Expected heads50.00%
Observed heads—
95% Wilson interval—
Longest streak—
Why this is fair
Each normal flip is decided before the animation using crypto.getRandomValues(). One random bit maps to Heads or Tails, so there is no modulo bias. The animation only reveals the already-selected result.
0Total flips
—Heads
—Tails
—Current streak