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What's the difference?

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All stages · Demo 334

Icelandic kennitala

Choice kt / tmp / other. Ten digits; check is position 9, century 0/8/9. Jev never mods 11. Nine digits need the century.

ChoiceKennitala mod-11 in JS

A digit tape. 0101852039 books a Þjóðskrá plate. A check-digit flip rejects. Nine digits never pass.

replaykind —kt —

STANDBY

All 4056 stages

Educational stage on jev.page — not the official TypeSafe console. Live calls go to POST https://api.typesafe.ai/v1/systemone from your browser when you paste a key. Without a key, the stage plays a recorded decision shaped like jev-1.13.0. Jev does not write the UI copy.