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What's the difference?

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All stages · Demo 402

Spanish NSS

Choice nss / vat / other. Twelve digits; last two = first ten % 97. Jev never mods 97. Eleven digits need 12. Distinct from NIF.

ChoiceNSS 97 in JS

A digit tape. 281234567840 books a Tesorería plate. A last-digit flip rejects. Eleven digits never pass.

replaykind —nss —

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.