Mochiru: Retirement Simulator
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Description
Mochiru is a fully offline retirement asset longevity simulator covering your whole financial lifecycle: accumulation, retirement, and drawdown. It answers one question with Monte Carlo simulation: how long will your money last?
WHO IT IS FOR
You want to see, in numbers, how many years your retirement assets will last
You are planning FIRE / early retirement and want distributions, not a single optimistic line
You want a drawdown plan that includes your pension, on your own assumptions
You want everything on-device: no account linking, no sign-up
WHAT YOU CAN DO
Visualize success rate, depletion probability, asset longevity, and terminal wealth as a fan chart
Enter your public pension (claiming age 60-75) and other regular income; income is deducted from required withdrawals
Switch between four withdrawal strategies: fixed amount, fixed rate, dynamic guardrail, floor and ceiling
Inverse analysis: solve the withdrawal amount that meets a target success rate (80-95%)
Sensitivity analysis: sweep withdrawal rate, retirement age, and equity ratio
Actuals tracking: log your total assets and compare reality with the plan
Share your result as a single image (free)
3-question quick start gets you to your first result in seconds
Siri Shortcuts to check your success rate or rerun the simulation
PREMIUM (one-time purchase, no subscription)
Sequence-of-returns risk analysis, currency-hedge comparison, historical backtest
Unlimited scenario saving and side-by-side comparison, PDF report export, higher simulation path counts
WHY MOCHIRU
Built for JPY-based investors holding USD equities: it preserves the crash correlation where falling stocks and a strengthening yen hit your assets at the same time - a risk that simple "expected return plus risk" tools often miss
Parametric assumptions plus historical block-bootstrap sampling
PRIVACY
Fully offline. Zero network calls, zero data collection, no account linking, no registration. All computation happens on your device.
IN THIS VERSION
Public pension (claiming age 60-75) and other regular income; income is applied first and only the shortfall is withdrawn
Solver: find the annual amount you can spend for a target success rate (80-95%)
Actuals tracking, one-image sharing (free), a three-question quick start and Siri Shortcuts
All amounts are in Japanese yen (JPY). US equities are held in USD and converted to yen for the simulation
The series used in "Historical" mode is a bundled sample (synthetic data), not real market data
NOTE
This app is a simulation for general information and learning purposes. It does not recommend specific financial products or advise on the timing of trades. Results are calculations based on the assumptions you enter and do not guarantee future investment performance.