Coin Tossの使い方
Make binary decisions with realistic 3D animation that is visually enjoyable.
What is Coin Toss?
Coin Toss is a digital version of flipping a physical coin for a two-option decision. The 3D animation gives a few seconds of suspense, and the tool keeps a running count of the last 100 flips so you can see the result converge toward 50/50 over time. For three or more options, use the Roulette or Picker instead.
使い方の手順
Assign heads and tails
Decide "heads means A, tails means B" before flipping. Changing the assignment after the result is unfair. The tool shows Heads and Tails as standard labels.
Tap to flip
Tap or click the central coin. The coin spins in 3D for about three seconds. Additional taps during the animation are ignored to prevent peeking or retries.
Read the result
When the coin lands, Heads or Tails is shown large. Apply your prior assignment and accept the result. "One more" is tempting, but it undermines the fairness of a coin toss.
Inspect the statistics
Below the coin you can see the counts and probabilities for heads and tails. With few flips the split is far from 50/50; after 50–100 flips it converges. Useful for probability teaching or verifying the tool is fair.
A concrete scenario
A couple deciding who washes the dishes tonight
Situation
Both partners are exhausted after work. Rock-paper-scissors has become routine after ten years. They want a bit of novelty for a nightly decision.
How it played out
One of them opens Coin Toss on their phone, announces "heads = husband, tails = wife", and taps. The three-second animation creates a tiny moment of suspense, then the result appears. Whoever won reacts, whoever lost groans — the decision is made in under 10 seconds, and the little ritual becomes part of the evening.
ヒントとコツ
- Assign heads/tails before you flip — not after
- Statistics track the last 100 flips automatically
- Reset button clears statistics without erasing individual results
- Small sample sizes look biased — only 100+ flips approach 50/50
こんな時に便利
Common mistakes to avoid
- 1Using a coin toss for three or more options — it only handles two. Use the Roulette or Picker.
- 2Believing "two tails in a row means heads is due next" — the gambler's fallacy. Each flip is independent.
- 3Concluding the tool is biased after 10 flips — you need 100+ for theoretical values to emerge.
- 4Re-flipping until you like the result — this negates the purpose of using a coin.