Market Replay

Replay rewinds a chart to a point in history and plays it forward one bar at a time, hiding everything to the right of the cursor. Indicators recalculate as bars arrive, drawings behave normally, and there is no way to peek ahead. It is the only honest way to practise a discretionary process, because a chart you already know the answer to teaches you nothing.

Start by picking a date, then step manually with the keyboard or let it run at a speed from one quarter to sixty four times real time. Multi-timeframe layouts stay synchronised during replay, so the hourly and daily charts advance together and you see exactly what you would have seen at that moment on both.

Paper orders can be placed during replay. Buy and sell at the current replay price, attach a stop and a target, and the engine fills them against subsequent bars using the same model the backtester uses. At the end of a session you get a trade list, an equity curve and the usual statistics, which makes replay a bridge between discretionary trading and a written rule set.

Replay is also a debugging tool for scripts. Load your own indicator, step through the bars around a signal you did not understand, and inspect the plotted values at each step. Most script bugs are off-by-one errors in history references, and they are obvious the moment you can see the value on a bar-by-bar basis.

Data availability follows the plan. Intraday replay depth is limited by the intraday history retained for your tier; daily and weekly replay reaches back as far as the end-of-day archive goes.