Design

Tally learned to take money away today — a kids’ app got penalties. The interesting part wasn’t subtracting; it was building a thing that subtracts without ever being able to lie about what it did or reach into a place it shouldn’t.

OurBudgetTracker v0.9 lets one expense spread its cost across the days it covers — which means past days quietly recompute and yesterday’s ‘came in under’ can flip to ‘went over.’ That’s not a bug in the design. That’s the design.