意思決定・決断

オンラインコイントス

デジタルで正確なコイントス

手元に硬貨がなくても大丈夫。暗号学的に公平なコイン投げを再現。

スポーツの先攻後攻決めや、ちょっとした勝負事に最適なデジタルコイントスです。

主な活用シーン

Game Night: Decide turn order, who plays White in chess, or drafts first in fantasy.
Chore Division: Fairly assign dishes, dog walking, or driving duty without arguments.
Sports Arbitrations: Cashless kickoffs and field side picks for local rec leagues.

Coin Flip Strategy & Cryptographic Trust

The Stanford Bias01

Physical Coins vs. Digital Parity

Stanford mathematician Persi Diaconis proved that real coins have a ~51% tendency to land on the face that was up before flipping due to precession wobbles. Our Web Crypto engine eliminates physical tilt completely.

Best 2 of 302

Auditable Series Resolution

Need higher stakes drama? Flip 3 times and check the timestamped Results tab to tally Heads vs Tails without second-guessing or disputed catches.

Edge Wildcards03

Custom Third-Outcome Slices

Click Entries to insert a rare 'Edge' or 'Re-flip' slice with a low weight (e.g. 1 weight vs 100 on Heads/Tails) for entertaining edge-case rules.

Exact 50.000% Heads/Tails Split

Zero Physical Bias

Each side occupies exactly 180° of the circumference. Uniform client-side random floats ensure zero mechanical wear, finger thumb torque, or wind drag.

よくあるご質問 (FAQ)

Why use this wheel instead of asking a smart speaker or flipping a penny?

Voice assistants generate answers invisibly behind a black box. Our wheel displays the physical deceleration live on screen with a public pointer, making the outcome visibly verifiable to everyone in the room.

Can I customize the coin labels to team names or colors?

Yes. Open the Entries tab on the right panel to rename 'Heads' and 'Tails' to team names, player handles, or choose custom slice colors.

Does this require downloading an app or signing in?

No. It runs entirely inside any modern web browser on iPhone, Android, tablet, or desktop with instant load times and zero account setup.