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What's the difference?

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All stages · Demo 268

BSN 11-proef

Choice tax / zorg / other. A Dutch BSN is nine digits; weights 9 through 2 and −1 on the last. Jev never mods 11. Eight digits need 9.

ChoiceBSN 11-proef in JS

A digit tape. 111222333 books tax. A last-digit flip rejects. Eight digits never pass.

replaykind —bsn —

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.