DingTou APP (美股定投计算器) is a free online tool that backtests US stock dollar-cost averaging strategies using real historical daily price data, providing detailed performance metrics and visual charts.
What is DingTou APP?
DingTou APP is a web-based DCA (dollar-cost averaging) backtesting calculator for US stocks and ETFs. It takes a stock symbol, initial investment amount, periodic investment amount, interval (in days), and a date range as inputs. It then fetches real historical daily closing prices (up to 5 years) and computes the complete investment timeline, including every purchase, cumulative cost, shares held, and portfolio value. The output includes summary statistics (total return, annualized return, total profit, number of buys) and a full transaction table, plus an interactive chart showing cumulative investment vs. portfolio value over time. The tool is free to use and runs entirely in the browser.
Key Features
- Real historical prices — Automatically retrieves up to 5 years of daily closing prices for any US stock or ETF symbol.
- Customizable parameters — Set initial lump sum, periodic investment amount, interval (days), start and end dates. No sign-up required.
- Comprehensive results — Displays total return %, total profit, final asset value, annualized return, number of purchases, and total shares held.
- Transaction detail table — 269-row table (as shown in the example) listing each purchase date, amount, cumulative cost, price, shares bought, cumulative shares, market value, and stage return %.
- Interactive chart — Area chart comparing cumulative investment vs. portfolio value over time, with hover details and zoom.
- Quick-select popular symbols — One-click buttons for SPY, QQQ, VTI, AAPL, MSFT, TSLA, and TSM.
- Multi-period metric display — Shows 1-year, 3-year, and 5-year annualized returns for the selected symbol at a glance.
- Free and no installation — Works on any device with a modern browser, no download or registration.
Who is it for?
- US stock DCA beginners — Learn how a fixed periodic investment would have performed historically with any symbol.
- Long-term investors — Test different DCA strategies (e.g., weekly vs. monthly) to compare outcomes over the same period.
- Investment educators — Demonstrate the power of DCA using real data and visual charts to students or clients.
- DIY portfolio backtesters — Quickly evaluate the effect of lump sum vs. gradual entry for a specific stock or ETF.
What can you do with DingTou APP?
- Compare DCA frequencies — Set different intervals (e.g., 7 days vs. 30 days) and see how return and volatility differ for the same symbol and period.
- Test lump sum vs. DCA — Use the initial investment field to compare a one-time purchase with a periodic plan.
- Analyze any US stock or ETF — Enter any ticker (e.g., AAPL, TSLA, QQQ) and get instant backtest results with full history.
- Export or share results — The chart and table can be captured manually; results are immediately viewable without login.
