cFIREsim
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cFIREsim lets you build a retirement plan that's specific to your life, adding or removing income and spending events year by year. Each scenario then replays against decades of actual historical market performance to show how many timelines you'd have succeeded in.
The event-by-event flexibility appeals to people with complex retirements, like those with pensions, planned travel years, or irregular income. Running against real historical returns rather than simulations gives you confidence grounded in what actually happened.