4sons.com / joni
Joni
Tokyo, 2026. The family budget pages live here — updated from the Wise export whenever there's a new one.
Joni's Yen Ledger
Month by month against the budget: all-in, food, cash, envelopes, top merchants, and what to do next.
September 2026 refresh · data through Sep 10
Budget Calculator
Set the two sliders — card headroom and the cash envelope — and see the monthly number and the weekly food rule.
single-room edition · dorm ¥85,000
Both pages switch between ¥ and $ at the top right. Numbers come from the Wise transaction export; nothing here is typed in by hand.