Working tools, no signup, no paywall, no upsell at the end. Educational — they compute, you decide.
American (binomial) & European (Black-Scholes) pricing, all five Greeks, payoff chart, and a P/L matrix.
How many shares to buy so a stopped-out trade costs exactly what you planned — plus reward-to-risk.
Starting amount + monthly habit + years = the chart that explains every retirement account.
The snowball, projected: income by year, DRIP on or off, and yield on cost over time.