Kuji Spin

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How we keep it fair

What decides each result, a check you can run yourself, and what we can't prove yet.

Your lists stay on this device. Names are never uploaded.

How the result is decided

  • The result is decided the moment you press Spin, before the wheel moves. The spin only shows it.
  • It uses the security-grade random numbers built into your device, the same kind used to make passwords.
  • Some quick methods pick the first names slightly more often. We don't: when a random number lands in the small leftover range that would cause this, we throw it away and draw a new one.
  • The pointer stops at an even spot inside the middle 90% of the winning slice. It never lands on a line, and nothing is staged to look like a near miss.
  • Stop and skip only make the spin shorter. The result stays the same.
  • A weight like Ava*3 always shows as a slice three times bigger. There is no hidden mode and no hidden weight.

Spin it 10,000 times yourself

This runs the exact pick the wheel uses, many times in a row, here in your browser. Nothing is sent anywhere. With a fair draw, each name comes up about as often as its slice size says.

12 names

Example names. Paste your own list to check it.

One per line. Ava*3 counts three times.

Spins

Check a List ID

Every result shows a List ID made from the names, their order and their weights. Paste the list here to see its List ID. If it matches the one on the result, the list was not changed.

Paste a list to see its List ID.

This browser can't make a List ID on this page.

List ID of this list4BB9-9CD1-FC80

Full fingerprint4BB99CD1FC80EA0F08CA02C4BE8C9B04110B10436C6510958AF6C814E00235ED

The List ID is the start of this fingerprint (SHA-256) of the list. The same list always gives the same one, and one changed letter changes it completely. Spaces at the ends of lines and empty lines don't count.

What this does not prove

The List ID shows the list was not changed. It cannot prove the host didn't spin again on another device until they liked the result.

Planned for later: a public check page. The host publishes a fingerprint before the spin, so anyone can confirm the result afterwards.

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