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What's the difference?

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All stages · Demo 316

Belgian NN

Choice nn / bis / other. Eleven digits; check is 97 minus the first nine mod 97, or with a leading 2 for 2000s. Jev never mods 97. Ten digits need 11.

ChoiceNN mod-97 in JS

A digit tape. 85010100115 books a rijksregister plate. A last-digit flip rejects. Ten digits never pass.

replaykind —nn —

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.