The chart in the strategy builder
In the web app, every condition you edit is drawn on a chart beside the form, on real history, with the bars it was met on marked underneath. This guide is what the chart shows, what it deliberately does not, and how to use it while you build.
What is drawn
Pick a market and a timeframe at the top of the chart and the app draws the indicator of the condition you are editing exactly as the scanner computes it — the same arithmetic, on the same candles. A moving average appears as a line over the candles; an oscillator such as RSI gets its own pane with its levels; a channel is shaded. Change a setting and the line redraws. The eye icon on each condition hides or shows its line, and the colour of the swatch beside a condition is the colour of its line.
Under the chart is a strip per condition: a bar is lit where that condition was true at the close. A fourth strip, "whole strategy met", lights where every required condition was true together. That strip is the strategy as the scanner would have seen it, bar by bar, and it is the quickest way to find out whether two conditions ever coincide at all.
What is not drawn, and why
A condition reads its own timeframe. If the chart is showing 4-hour candles and a condition reads the 1-hour chart, its line is not drawn — the builder says "not on the 4h chart" beside it, with a link that switches the chart to the condition's timeframe. The line could be computed on the 4-hour candles, but it would be the 4-hour version of the indicator, which is not what the alert evaluates, and a chart that showed it would be lying politely. The met strip for that condition is still shown, because met-or-not is a fact about the bar whichever chart you are looking at.
The chart's market and timeframe are also independent of where the strategy is applied. The chart is a window for checking the definition; applying is a separate step, covered in its own guide.
Dragging a setting
Each numeric setting has a slider. Drag it and the line and the met strip redraw at every step, so you can watch a period of 14 become 21 and see which bars drop out. The app fetches a block of values around the one you pressed on in a single request, so the drag is smooth rather than a request per pixel; a long drag fetches the next block when it reaches the edge. Every redraw is a real replay on real history, which is why a chart on a 1-minute timeframe over months of candles takes a moment while a 4-hour one is instant.
Counting matches
The met strips show where conditions held. The Count matches button under the form answers the narrower question the alert cares about: how many times, over the recent window, would the strategy have crossed into being met — which is when an alert fires, once, rather than every bar it stays met. The alert guide explains why those are different numbers. Neither the strips nor the count say anything about what price did next; that is what the entry check is for.
What the chart is evidence of
That your definition means what you think it means. Seeing the line, and the bars it was met on, catches the two mistakes that are otherwise invisible: a condition that is true almost always, and one that is true almost never. It is a check on the sentence, not on the idea. The candles are the market-data provider's and carry its attribution.