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What's the difference?

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All stages · Demo 275

TFN mill

Choice individual / company / other. A TFN is nine digits; weights 1,4,3,7,5,8,6,9,10 must sum to 0 mod 11. Jev never weights them. Seven digits need 9.

ChoiceTFN mod-11 in JS

A digit tape. 123456782 books an individual. A last-digit flip rejects. Seven digits never pass.

replaykind —tfn —

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.