Divvy

A backtester that replays the exact money you actually invested — real dates, real dollar amounts from your broker — into a counterfactual portfolio, and reports the dividends (first-class) and returns you'd have earned. DRIP compounding, money-weighted XIRR, an interactive Experiment Lab, private by default.

Read the full write-up → “I replayed the money I actually invested into portfolios I never owned”