FIRE planning, not just forecasting
Monarch's Plus tier ($199/year) added forecasting with life-event modelling and what-if scenarios. That is useful for general planning. But it is a deterministic projection: a single line extending your current behaviour into the future. There is no Monte Carlo simulation testing thousands of market scenarios, no historical backtesting, and no probability-of-success scoring.
Endute's FIRE module is purpose-built for financial independence. Multi-phase plans (accumulation, semi-retirement, full retirement), Monte Carlo across thousands of randomised scenarios, backtesting against the Shiller dataset, and an interactive what-if explorer that shows how each variable affects your FI date. If you are planning to retire early, the depth difference matters.
