Stock strategy backtester
“What if I bought every time the price dropped 5% and sold the next day?” Test it in seconds on real daily prices — against simply buying and holding. Free, no signup.
What this tool does
Search for a company or ticker (stocks, ETFs, crypto), pick one of three classic rule templates, and the backtester replays the last five years of daily closing prices to show what the rule would have returned versus buy & hold: total return, CAGR, maximum drawdown, win rate, and every individual trade.
The three strategies
Dip buyer— buys at the close of any day that fell at least your chosen percentage, and sells a set number of trading days later. The classic “buy the dip” hypothesis, quantified.
SMA cross — stays invested while the fast simple moving average (say, 20 days) is above the slow one (say, 50 days) and steps aside when it crosses back under. The textbook trend-following rule.
DCA / what-if — invests a fixed amount every month or week no matter what, and shows what that steady plan grew into versus investing everything on day one.
What it deliberately leaves out
Results use daily closing prices. Dividends arecounted and treated as reinvested, because the prices are adjusted for them — which matters a lot for income stocks. Trading fees and slippage are off unless you set them under “Detailed setup”; taxes are never modelled. Only still-listed tickers can be tested, which flatters every strategy (survivorship bias). Past results predict nothing. This is an educational tool, not investment advice.
Just want to know what investing a fixed amount every month would have grown into? That’s the DCA calculator.
Want to run rules against your own actual portfolio, combine indicators, or test longer histories? That’s what Pulse is for.