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What's the difference?

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All stages · Demo 300

Partita IVA

Choice iva / cf / other. An Italian VAT number is eleven digits with a Luhn check. Jev never doubles from the right. Ten digits need 11.

ChoiceIVA Luhn in JS

A digit tape. 12345678903 books an IVA plate. A last-digit flip rejects. Ten digits never pass.

replaykind —piva —

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.