1. Firenum
Free FIRE calculator suite for planning early retirement. Calculate your FIRE number, Coast FIRE, Lean/Fat/Barista FIRE, project retirement dates, and track net worth with the Progress Tracker. Project your journey towards FIRE on a dashboard. Model market crash scenarios and other events. Supports 8 currencies. No signup, 100% private, data never leaves your browser.
Firenum is the closest match to ProjectionLab on this list. It is a month-by-month FIRE and retirement planner that runs Monte Carlo simulations, backtests your plan against historical market data and stress tests it with market crashes, job loss or high inflation. The difference is the model around it, since Firenum is free, needs no signup and keeps every number in your browser.









