A math-first thinking tool for personal finance.

Learnberry is a set of interactive simulators for thinking through personal finance decisions. Every model is built around a real equation. Not a black box, not a guess.

The goal is clarity. Most financial tools either oversimplify (a single number answer) or overwhelm (dozens of inputs). Learnberry sits in between: just enough parameters to be honest, simple enough to be useful.

This is not financial advice. It is a thinking aid. Use it to build intuition, stress-test assumptions, and ask better questions.

No accounts. No tracking. No data leaves your browser. The math runs locally and that is intentional.