RuinRisk
iOS app by RYUICHIROU SHIMONO. Finance · RYUICHIROU SHIMONO
- Store rating
- 4 / 5
- Store rating count
- 1
- Download price
- Free to download
- In-app purchases
- Unknown
- Version
- 4.3
- Listing last refreshed
- 2026-09-10
View the original store listing
Store description excerpt
Calculate your risk of ruin instantly — just move the sliders. Enter three numbers: win rate, risk-to-reward ratio, and the share of capital you risk per trade. RuinRisk tells you the probability that your account runs out if you keep trading that way. CALCULATE THE RISK OF RUIN (CALC) - Three sliders, recalculated in real time - See the exact Theoretical value and the fast Estimated approximation side by side. A large gap means the approximation is less reliable for those inputs - Toggle compounding, and set the equity level you treat as ruin - A probability that is small but not zero is shown as under 1% or under 0.1% instead of rounding down to 0, so risk is never understated SEE THE WHOLE PICTURE (HEATMAP) - One grid showing the risk of ruin across two parameters at once - Choose which parameter to hold fixed and redraw the grid for that case - Pinch to zoom, double-tap to return to the default scale MONTE CARLO ANALYSIS (PREMIUM) - Maximum drawdown distributions over 100, 500 and 1000 trades - Insight that reads out your Kelly fraction, expected value and the parameters driving most of your risk - Selectable simulation quality DATA MATRIX (PREMIUM) - Compare several scenarios side by side - Export to CSV and reuse the numbers in a spreadsheet HOW THIS APP WORKS - One-time purchase. No subscriptions - No ads, no accounts, no tracking - Every calculation runs on your device and works offline - iPhone and iPad, in English and Japanese PLEASE NOTE RuinRisk is a calculation and visualization tool based on probability models, not investment advice. It assumes each trade is independent and that your win rate and risk-to-reward ratio stay constant. Real markets add slippage and psychology, so treat the results as one input to your decision.
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