OptSim225

OptSim 225 is a trading simulator dedicated to Nikkei 225 futures and options. It has no real order-placement function, so you can focus on learning option strategies and risk metrics simply by trying things out. From beginners to intermediate option traders, it is ideal for study and practice before putting real money on the line.

■ Who it is for
- Anyone starting to learn how Nikkei 225 options work
- Those who want to see each strategy's profit/loss picture (payoff) visually
- Those who want to easily calculate Black-Scholes theoretical prices and Greeks
- Those who want a rough feel for margin requirements in advance

■ Main features
◎ Strategy suggestions
Browse representative option strategy templates by market view — bullish, bearish, range-bound, or volatile. Create a virtual position with a single tap from any card.

◎ Position management
Build virtual positions combining option and futures legs, and track profit/loss (P&L). Supports group (folder) organization, settlement from SQ values, and saved trade history.

◎ Payoff diagram
Plot P&L curves for both expiry and the current point (based on BS theoretical prices). Check breakeven points, maximum profit, maximum loss, and total Greeks.

◎ Option chain
Display a chain of BS theoretical prices around ATM. The ATM row is highlighted, showing call/put theoretical prices and IV side by side.

◎ Black-Scholes evaluation
Calculate theoretical prices and Greeks (Δ, Γ, θ, ν, ρ) with the Black-Scholes model. Back out IV from market prices and draw the IV smile curve.

◎ VaR margin simulation (reference)
Calculate an approximate portfolio VaR for your positions to get a rough idea of margin.

■ Calculation logic
- Automatically selects the interest-rate tenor by days to expiry
- Time to maturity counted per Osaka Exchange (OSE) definitions
- Supports the product specs of Nikkei 225 futures (Large / Mini / Micro) and options (standard / mini)

■ Privacy and peace of mind
- No account registration required
- All positions and settings stored on your device
- Core features work offline
- Light / dark theme and Japanese / English display

■ Important notes
This app is a study tool for simulation only. It has no function to broker or place actual trades. All displayed theoretical prices, IV, VaR, and other figures are approximate reference values and differ from actual market prices and the required margin calculated by brokerages. Please confirm accurate figures and rules with your securities broker and each official source. This app does not recommend any specific instrument or transaction; make your final investment decisions at your own responsibility.