About this app

Draws implied volatility across strikes against the flat line Black-Scholes assumes, with sliders for at-the-money level, skew and curvature, plus five presets — equity index, single stock, commodity, pre-earnings and textbook — each with a sentence on why that shape occurs. A strike ladder reports the vol at each moneyness and the 90/110 risk reversal. The practical point: a model quoting one volatility misprices every strike but the fitted one, and worst in the wings where options are actually used.