Type "dinner 120, me and Sarah, I paid" and JotSplit extracts the amount, payer, and participants. No forms, no dropdowns. The AI only extracts fields. Every calculation is deterministic code, and nothing counts until you confirm it on a review page. An expense you didn't approve doesn't exist. Balances are never stored — always computed, so they can't drift. Built solo. 1.1 just shipped with push notifications. iOS, free.