Independent browser Web Crypto trials
Run two independent coin flips together and inspect both outcomes.
Run the batch to see every outcome.
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Two coins have four equally likely ordered sequences: HH, HT, TH, and TT. One head and one tail occurs in two of those four sequences, so a split result has probability 50%.
Every coin is sampled independently from the same tested random-bit function. The animation reveals results already selected in your browser and does not influence them.
For repeatable charts, run comparison, and CSV export, use the probability experiment.
A balanced random source makes each side equally likely on each trial; it does not promise an equal split in this particular batch. Repeated outcomes and imbalanced batches are expected parts of random variation. Read the method and limitations before using a result in a dispute.