DingTou App
Backtest US stock and ETF dollar-cost averaging returns
About DingTou App
DingTou App is a free web calculator for investors who want to test dollar-cost averaging (DCA, or 定投) on US stocks and ETFs before committing money. Users enter a ticker such as SPY, QQQ or AAPL, set an initial lump sum, a recurring contribution and the interval in days, then choose a start and end date. The tool loads daily price history for the chosen symbol and simulates each purchase.
The results show total return, annualized return, shares held, final asset value and a per-purchase breakdown, along with a chart comparing cumulative invested capital to position value. It is aimed mainly at beginners and Chinese-speaking investors who want to see how a regular investment plan would have performed over past periods.
The site also includes Chinese-language learning articles on DCA basics, choosing a contribution frequency and comparing ETFs with individual stocks. The page states that its data may be delayed or incomplete and that its content is not investment advice.
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