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What's the difference?

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All stages · Demo 301

Portuguese NIF

Choice pessoa / empresa / other. Nine digits; remainder 11, 10 and 11 become 0. Jev never mods 11. Eight digits need 9.

ChoiceNIFPT mod-11 in JS

A digit tape. 501234560 books a pessoa. A last-digit flip rejects. Eight digits never pass.

replaykind —nifpt —

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.