CallPutHub

CallPutHub is a free, browser-based toolkit for understanding options trades. Choose from 20 focused calculators or build a single- or multi-leg position from 58 strategy templates. See debit or credit, maximum profit and loss, breakevens, and expiration payoff, then stress-test price, time, and volatility scenarios. Pre-expiration values are clearly labeled as model estimates, while exact expiration math is based on your inputs. No account or subscription is required; optional MarketData.app access lets you bring your own option-chain data.