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What's the difference?

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All stages · Demo 411

Serbian PIB

Choice rs / vat / other. Nine digits; running (n+d)%10 then ×2%11. Jev never walks 7064. Eight digits need 9.

ChoicePIB 7064 in JS

A digit tape. 123456788 books an APR plate. A last-digit flip rejects. Eight digits never pass.

replaykind —pib —

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.