Candlestick Pattern Simulator

The Chart Simulator is a candlestick replay tool. It builds a fresh synthetic price series every time you load it, scans that series for classic candlestick patterns, and marks each one on the chart — so you can watch a setup form bar by bar rather than meeting it already finished in a textbook diagram.

Running a replay

Press play — or hit the spacebar — to reveal candles one at a time. The amber progress bar under the toolbar shows how far through the series you are. The speed buttons run the replay at 1×, 2×, 5× or 10×. To move manually, use the step-back and step-forward arrows or the ← and → keys, and the skip buttons to jump straight to the start or the end. The ↺ button generates a new chart with a different set of patterns; on narrow screens, where it is hidden, switching the symbol or timeframe does the same.

Choosing what to plot

The symbol dropdown covers stocks, crypto, forex and futures. Each timeframe button, from 15m to 1W, generates a new series with its bars spaced that far apart rather than re-aggregating the current one, and a candle moves about as much on one timeframe as on another. Overlay EMA 9, EMA 20, EMA 50 or VWAP from the toolbar, and switch the lower pane between volume, RSI and MACD.

What to look for

The Pattern Library panel on the left (the Patterns tab on narrow screens) has 24 patterns to study — Doji, Hammer, Bullish and Bearish Engulfing, Harami, Morning and Evening Star, Three White Soldiers, Tweezer tops and bottoms, and more (how to read candlestick charts covers the anatomy behind each one). Some of them can't form in this simulator's price model, because each candle opens at the previous close and bodies are never tiny: the three Doji patterns, Piercing Line, Dark Cloud Cover, both Haramis and Three Inside Up and Down never appear on the chart, and their entries say so. Click a pattern to highlight only its occurrences, or click a marker on the chart to open its explanation, including the market psychology behind the setup and what confirms or invalidates it. The most useful habit: pause on a marker, predict the next candle, then step forward and check. Context matters more than the shape — a reversal pattern only means something after a real trend. On a real chart, volume behind the signal candle also helps separate a genuine turn from noise; the volume here is random, so that check is one for real markets rather than this chart.