For years I'd read about mental accounting and the behavioral biases that supposedly make us bad at managing money. But the prescribed fix was always the same: suppress them. Be more rational. Stick to a budget. Track every dollar. That never worked for me, and I don't think it works for most people. So I built the opposite. Justy aligns with how people already think about day-to-day spending. You don't plan what you'll spend. You add the money you didn't spend into the app. It's money your brain has already let go of, so adding it doesn't feel like a sacrifice. Skipped the $6 coffee? The $50 delivery? Canceled plans that would have cost you $100? Add those to Justy. The number grows from real choices, not from a spreadsheet telling you what you were supposed to do. If you didn't spend it, you earned it. Built during my MBA at UChicago. Would love your feedback.

Justy

Personal finance tracker turned upside down

Personal finance tracker turned upside down