PlainQuant

Stock backtests, with the honest number

Check a stock you own, then test a rule on it. See an example →

Several? Separate with commas.

Our method

Three things most backtests leave out

  1. Delisted stocks stay in

    US tests include stocks that were later delisted.

  2. Every try is counted

    The more settings you try, the bigger the discount.

  3. Costs are charged

    Every simulated trade pays commission, fees and the spread.

By the numbers

Stocks covered
1,918
Hong Kong · US
Years of daily prices
8
2018–2026
Separate test periods per backtest
3
Shown period by period, not just in total.

US data includes delisted stocks; Hong Kong data mostly lacks them.

Or test a rule

HK and US stocks · daily bars · long only.

Or pick a rule

About

Independent, by design

Built by an independent trader. Too many investors lose money trading without discipline; this site lets you test an idea first.

No advice. No affiliates. We don't sell your data.