The math behind life's biggest decisions, built into tools and visualizations that show you exactly where each path leads.
Every topic is a maze worth navigating.
Tools
See how your calorie strategy plays out over time — including the metabolism slowdown most calculators ignore.
Journeys
Why progress stalls, what the data says, and how to think about your cut.
The math behind one of the biggest financial decisions you'll ever make. How to think about the true cost of each path.
Model the true cost of buying vs. renting a home. See how equity and investment returns diverge over time, and find where the two paths cross.