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What's the difference?

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All stages · Demo 409

Czech IČO

Choice cz / vat / other. Eight digits; (11−sum%11)%10. Jev never mods 11. Seven digits need 8. Distinct from rodné číslo.

ChoiceIČO 8-7-6 in JS

A digit tape. 12345679 books an ARES plate. A last-digit flip rejects. Seven digits never pass.

replaykind —ico —

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.