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What's the difference?

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All stages · Demo 340

Spanish CIF

Choice cif / vat / other. Letter + 7 + digit or J–I. ABEH keep a digit; KPQSW take a letter. Jev never folds doubles. Seven digits need the control.

ChoiceCIF walk in JS

A digit tape. A12345674 books an AEAT plate. A last-digit flip rejects. Seven digits never pass.

replaykind —cif —

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.