# RuinRisk — Risk of Ruin Calculator

> Investment and trading risk analysis app for probability of ruin calculation. (iPhone/iPad app by RYUICHIROU SHIMONO.)

- Source: https://appshunter.io/ios/app/ruinrisk/id983505276 (this page in markdown: same URL + `.md`)
- Developer: [RYUICHIROU SHIMONO](https://appshunter.io/developer/696880855)
- Category: Finance, Business
- Price: Free (on sale, was $1.99)
- Rating: 4.00/5 from 1 App Store ratings · 5 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.6 · 1 MB
- Languages: American English, Japanese
- Released: 2015-04-17
- Data updated: 2026-08-28
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/ruinrisk/id983505276/reviews.md

## What is RuinRisk?

RuinRisk – Investment Risk Through the Lens of Ruin Probability

RuinRisk helps traders and individual investors analyze investment risk through the lens of "risk of ruin." From three parameters — win rate, risk:reward ratio, and capital risk per trade — it visualizes risk using both a theoretical formula and Monte Carlo simulation, helping you make decisions based on numbers rather than gut feeling.

Key features:
• Ruin Probability Calculator (CALC): Shows both the theoretical (Balsara) value and a Monte Carlo–based estimate
• Risk Heatmap (HEATMAP): See at a glance how risk changes across parameter combinations, with suggested improvements
• Monte Carlo Analysis (ANALYSIS): Simulates drawdown probability. Evaluates risk from three distinct perspectives — Ruin Probability, Monte Carlo Analysis, and the Kelly Criterion — with recommendations tailored to each
• Data Matrix (MATRIX): A full table of drawdown probabilities by trade count and drawdown level. Save and compare multiple plans, and export to CSV

RuinRisk includes both a simple Legacy Mode and a more detailed Pro Mode. Pro Mode's advanced analysis features can be unlocked via in-app purchase.

*The information provided by this app is an estimate for reference purposes only. It does not constitute investment advice and does not guarantee future results. You are solely responsible for your own investment decisions.

## Key features

- Probability of Ruin Simulation
- Heatmap Risk Visualization
- Monte Carlo Simulations (Pro Mode)
- Maximum Drawdown Estimation (Pro Mode)
- Drawdown Probability Analysis (Pro Mode)
- Strategy Comparison

## Recent user reviews (5 of 5)

All indexed reviews: https://appshunter.io/ios/app/ruinrisk/id983505276/reviews.md

### 4/5 — Almost perfect

*2023-11-16*

Really good app, the developer gets it while others don’t, the only thing it needs is the ability to change the “ruin” threshold, to say 20% for instance, to calculate the risk of drawdown to the custom level. Will change to 5 stars if added

**Developer response:** Thank you for your review and comments. I will take your ideas into consideration for future updates.

### 5/5 — 手放せません

*2023-06-12*

自分のトレードの安全性を確認するのに最適です。破産確率のマトリックスをすぐに表示できるのも素晴らしいです。多くのトレーダーに使って頂きたいアプリです。

**Developer response:** 評価とコメントありがとうございます。皆さんのお役に立てていれば嬉しいです。

### 1/5 — 目標設定がわかりませんね。

*2022-09-02*

ゴールが10倍なのか100倍なのか。
その設定で数値も変わってくる。
それがないなんて信用できない。

**Developer response:** 目標は各々で設定してもらえれば良いと思います。それ次第でリスクをどこまで取るかが決まり、設定値も変わってきます。またこのアプリはあくまでも将来をシミュレーションした確率を求めるものです。その点をご理解ください。

### 5/5 — リスク資金比率の改善ありがとうございました！

*2021-04-27*

リスク資金比率を細かく見れるように、要望したところ、早速改善いただきありがとうございます。
トレード戦略を考える上で、リスク資金比率は非常に大切なので、これからも末永く使わせてもらいます。素敵なアプリ開発していただきありがとうございます。

**Developer response:** コメントと高評価ありがとうございます。パフォーマンス向上のために、これからも少しずつバージョンアップしていきたいと思います。

### 5/5 — 素晴らしい

*2018-12-22*

こういうのあったら良いなと検索したらこれにヒットしました！
助かりますありがとう〜

**Developer response:** 返信遅くなりましたが、ありがとうございます。

## Frequently asked questions about RuinRisk

### What is the probability of ruin in RuinRisk?

RuinRisk calculates the probability of ruin by analyzing parameters like risk per trade, payoff ratio, and win rate. This helps users understand their long-term capital risk based on mathematical models.

### Does RuinRisk offer advanced analysis features?

Yes, Pro Mode in RuinRisk provides advanced features including Monte Carlo simulations, maximum expected drawdown estimation, and drawdown probability analysis for more realistic risk assessments.

### How does RuinRisk help improve money management?

By visualizing the probability of ruin and allowing strategy comparison, RuinRisk encourages data-driven decisions over intuition, helping users refine their money management practices.

### What is the price of RuinRisk?

RuinRisk is a paid application, priced at $1.99. This one-time purchase grants access to its risk analysis features.

### What devices is RuinRisk available on?

RuinRisk is available on iPhone and iPad devices, indicated by its support for iOS platforms.

### How often is RuinRisk updated?

The latest version of RuinRisk is 4.0, and it was last updated on May 8, 2026. This suggests a recent update cycle.

### Is RuinRisk suitable for beginners?

Yes, RuinRisk is designed to be accessible for beginners with simple slider controls for risk evaluations, while also offering advanced tools for experienced traders.

### Does RuinRisk contain advertisements?

No, RuinRisk does not contain advertisements. As a paid application, it offers an ad-free experience for its users.

## Version history (last 5 releases)

### 4.2 — 2026-08-21

• Added a "Three Perspectives" view in the Monte Carlo Analysis screen, comparing Ruin Probability, Monte Carlo Analysis, and the Kelly Criterion side by side
• Improved clarity throughout: each analysis now separates the current situation from the recommendation
• Added the ability to save and compare multiple plans in the Data Matrix screen
• CSV exports now include the calculation conditions used (win rate, risk:reward ratio, capital risk, etc.)

### 4.1 — 2026-06-03

Internal improvements and code refinements.

### 4.0 — 2026-05-08

We've added a Pro View mode that allows for more detailed analysis.

### 3.1 — 2026-03-24

Announcement regarding move towards free service and minor fixes.

### 3.0 — 2026-01-20

- Increased the number of risk of ruin tables from one to three.
- Added more scale divisions to display the tables in greater detail.

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All apps by RYUICHIROU SHIMONO: https://appshunter.io/developer/696880855

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-28.*