Technical Support

📱 About KillLine

KillLine is a financial risk simulator that uses Monte Carlo simulation to help you assess your financial resilience. Through hundreds or thousands of random simulations, it evaluates how well your finances can withstand unexpected events like job loss, medical emergencies, and other financial shocks.

🚀 Getting Started

Step 1: Create Your Financial Profile

Open the app and tap on the "Profile" tab
Enter your monthly income and select income type
Add your monthly expenses by category
Enter your current emergency fund (savings)
Choose your preferred currency

Step 2: Configure Simulation Settings

Go to the "Settings" tab
Choose simulation iterations (100, 1,000, or 10,000)
Select a luck preset (Lucky, Normal, or Unlucky)
Optionally customize individual event probabilities

Step 3: Run Your First Simulation

Navigate to the "Dashboard" tab
Tap "Run Simulation" button
Watch the real-time animation (or skip to results)
Review your financial health score and survival rate

🎯 Key Features

🎲 Monte Carlo Simulation

Run up to 10,000 simulations to assess your financial resilience with statistical accuracy.

💼 10 Risk Events

Simulates real-world risks including unemployment, illness, medical emergencies, and more.

📊 Visual Analytics

Beautiful charts showing reserve fund trends, event markers, and survival statistics.

💡 Smart Recommendations

Get personalized suggestions to improve your financial health and risk resilience.

📱 Share Results

Export beautiful share cards with your simulation results to track progress.

🔒 Privacy First

All data stays on your device. No cloud sync, no data collection, complete privacy.

❓ Frequently Asked Questions

Q: What is Monte Carlo simulation?

Monte Carlo simulation is a statistical technique that runs thousands of random scenarios to predict possible outcomes. In KillLine, it simulates your financial future by randomly generating risk events based on their probabilities, giving you a realistic picture of your financial resilience.

Q: How many simulations should I run?

100 iterations: Quick test (~1 second) - Good for initial exploration
1,000 iterations: Daily assessment (~5 seconds) - Recommended for regular use
10,000 iterations: Important decisions (~30 seconds) - Best accuracy for major financial decisions

Q: What do the luck presets mean?

Lucky 🍀: All event probabilities reduced by 50% - For optimistic scenarios
Normal 😐: Based on statistical data - Realistic baseline
Unlucky 💀: All probabilities increased 2-3x - Stress testing worst-case scenarios

Q: Why is my health score low?

A low health score typically indicates insufficient emergency funds relative to your expenses. We recommend maintaining 6-12 months of expenses in your emergency fund. Review the recommendations tab for personalized suggestions to improve your score.

Q: Can multiple events happen at the same time?

Yes, multiple events can occur simultaneously in a simulation, except for unemployment and income reduction which are mutually exclusive. This reflects real-world scenarios where financial challenges often compound.

Q: How do I simulate the impact of buying a house?

Increase the housing expense probability to 10% and set the expense range to your expected down payment amount. This will help you assess whether you can handle the financial impact of a home purchase.

Q: Why does major illness affect both expenses and income?

Major illnesses typically require extended recovery time during which you cannot work normally, resulting in reduced income. The simulation reflects this reality by reducing income to 50% for 12 months in addition to medical expenses.

Q: Is my financial data safe?

Absolutely. All your data is stored locally on your device using Apple's Core Data framework. The app never connects to the internet, never uploads your data, and we have no servers. Your financial information stays completely private and under your control.

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Q: Can I export or backup my data?

Currently, you can export simulation results as images to your photo library. Full data backup and restore functionality is planned for a future update. Your data is automatically backed up if you have iCloud backup enabled for your device.

Q: What does the health score mean?

80-100 (Safe): Can handle most extreme situations
60-79 (Warning): Can handle regular risks
40-59 (Danger): May not handle extreme situations
0-39 (Critical): Emergency fund severely insufficient

Q: How often should I run simulations?

We recommend running simulations monthly to track your financial health trends, and before any major financial decisions like buying a house, changing jobs, or starting a business.

Understanding Results

Health Score

Your financial health score (0-100) indicates how well your finances can withstand unexpected events. It's calculated based on your survival rate across all simulations, median survival months, and worst-case scenarios.

Survival Rate

The percentage of simulations where you maintained positive reserves throughout the entire 60-month period. A higher survival rate indicates better financial resilience.

Median Survival Months

The middle value of how long you survived across all simulations. This gives you a realistic expectation of your financial endurance under various scenarios.

Best/Worst Case

Best Case: The highest ending reserve amount across all simulations (when luck is on your side)
Worst Case: The lowest ending reserve amount (when multiple unfortunate events occur)

Tips for Better Results

Build Emergency Fund: Aim for 6-12 months of expenses in savings
Reduce Fixed Expenses: Lower monthly commitments improve resilience
Diversify Income: Multiple income streams reduce unemployment risk
Get Insurance: Health and disability insurance protect against major events
Regular Monitoring: Run simulations monthly to track progress
Stress Test: Use "Unlucky" preset before major decisions

System Requirements

iOS Version: 15.0 or later
Compatible Devices: iPhone 8 and newer, all iPad models from 5th generation
Storage: Approximately 20 MB
Internet: Not required (works completely offline)
Languages: English, Simplified Chinese

Troubleshooting

App crashes or freezes during simulation

Try reducing the number of simulation iterations. If running 10,000 simulations, try 1,000 instead. Restart the app and try again. If the problem persists, please contact support.

Cannot save images to photo library

Go to Settings > Privacy > Photos and ensure KillLine has permission to add photos. You don't need to grant full photo library access, just "Add Photos Only" permission.

Data disappeared after app update

Your data should persist across updates. If you've lost data, check if you have an iCloud backup of your device. Restore from backup to recover your financial profiles and history.

Simulation results seem unrealistic

Check your event probability settings. If you've customized probabilities, they may be set too high or too low. Try resetting to a standard preset (Normal) and run the simulation again.

App not available in my language

Currently, KillLine supports English and Simplified Chinese. We're working on adding more languages in future updates. The app will automatically use your device's language if supported, otherwise it defaults to English.

Privacy & Security

KillLine is built with privacy as a core principle:

All data stored locally on your device
No internet connection required or used
No analytics or tracking
No third-party services
No data collection of any kind

For complete details, please read our Privacy Policy.

Feature Requests & Feedback

We're constantly working to improve KillLine. If you have suggestions for new features or improvements, we'd love to hear from you!

Planned features for future updates include:

iCloud sync for data backup
More detailed PDF reports
Additional chart types and visualizations
Goal setting and progress tracking
More language support

💬 Technical Support