Free tools
Tools for checking your own thinking.
Seven small tools that run in your browser, with no signup and nothing sent anywhere. They compute from the numbers you give them, or from clearly labelled simulated data. They state facts and arithmetic; they don’t give advice, opinions or forecasts about any instrument.
Position size & risk planner
How large can this position be if the stop costs me no more than I chose?
Units or forex lots from your balance, risk, entry and stop, with reward:risk, break-even hit rate and pip value.
Drawdown simulator
What drawdowns and losing streaks do my own assumptions imply?
Thousands of seeded random trade sequences from your hit rate, average win and risk per trade.
Trading cost calculator
What do commission, spread and slippage take from a run of trades?
Cost per round trip, the gross return each trade needs to break even, and gross against net balance over the years.
Overfitting lab
How good can a backtest look on data with no edge at all?
Grid-search a moving-average crossover on a random walk and compare the best in-sample result with out-of-sample.
Indicator lag lab
How much lag does a smoother moving average cost?
SMA, EMA, WMA and Hull averages over one simulated series, with each one’s lag in bars and its roughness.
Diversification lab
How far does adding holdings lower a portfolio’s volatility?
Equal-weight, long-only volatility from 1 to 50 holdings, and the floor a common correlation sets.
Chart types, side by side
What does each chart type keep, smooth or leave out?
One simulated series as candlesticks, OHLC bars, a line, Heikin-Ashi and Renko, with how each is built.