History
Historical mode replays your plan from every start year in the 1871 to 2023 record, built on Robert Shiller’s market series. Free, no unlock needed.
FIRE & retirement simulator
FIRE Path
Test a retirement plan against 150 years of real markets, then see the whole range of outcomes.
Free. FIRE Path Pro is a $9.99 one-time unlock.
Results, Monte Carlo and plan input.
FIRE Path runs your savings, spending and allocation across every real start year since 1871, so you see how a plan would have survived the Great Depression, the 1970s and 2008, not just an average. Everything runs on your device, with no account and no tracking.
Monte Carlo (Pro)
Run 1,000 to 10,000 trials that resample real history, and read the result as a fan chart with median and percentile bands.
Eight withdrawal strategies
The 4% rule and percent-of-portfolio are free. Pro adds Guyton-Klinger, Variable Percentage Withdrawal, Variable CAPE, Hebeler Autopilot and more, plus saved scenarios you can compare and export.
Privacy
Your assumptions and results stay on the device and the simulator works offline. The free tier shows one non-personalized banner ad; Pro removes it.
FIRE Path
iPhone & iPad. Available now. Free. FIRE Path Pro is a $9.99 one-time unlock.
Get it on the App Store