Build multi-leg option structures, covered calls, spreads, straddles, iron condors, and see the payoff before committing. Each leg is priced by the same Black-Scholes engine that prices the chain, so the diagram and the ticket cannot disagree about what the structure costs.

The point of the builder is the shape of the risk rather than the name of the strategy: what the position makes, what it loses, and between which prices. All contracts are simulated.