Day Trading Setups
Premarket High/Low Break
Whatever high and low prints before the opening bell becomes a level the regular session keeps reacting to, for reasons that have nothing to do with the chart pattern itself and everything to do with who was already watching it.
Replay the open, watch the level get tested
The dimmed candles on the left are the premarket session, thin volume, wider spreads. Once they set a high and a low, press play to run the regular session forward. The tool auto-detects the first real close beyond either rail and arms a mechanical trade: enter at the break, stop back inside the premarket range, target at twice that risk. Run new days to build a real sample of how often the level actually holds.
Premarket range is set. Press Play to run the regular session forward.
| Split | Trades | Hit target | Hit stop | Win rate |
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How it works
- The premarket high and low are real, computed from the dimmed bars. Nothing about them is hand-picked, they're just the highest high and lowest low of the thin, pre-bell session shown.
- A break only counts on a full-bar close, not a wick. The tool watches every regular-session bar and only arms a trade the moment one closes beyond the premarket high or low, exactly the rule a real level-break entry uses.
- The stop lives back inside the range, the target is measured in the same units. Risk is the distance from the break back to the opposite rail's midpoint, and the target sits two multiples of that same distance beyond the break.
- Every replay gets bucketed by which rail broke and whether the open had already gapped past it. A level that's broken by a gap at the open behaves differently from one broken intrasession after some chop, and the table tracks both separately.
Where this breaks
A level only means something if enough people are actually watching it
Premarket levels work as well as they do because a specific, identifiable group of traders sets orders around them before the bell. On a thin, low-volume premarket session, that same high or low can be almost meaningless, a handful of small prints with nobody behind them, and the regular session blows through it without hesitation. This simulator randomizes premarket volume and range the same way a real thin morning session does, and the honest result is that some days the level holds cleanly and some days it barely slows price down at all. There is no way to know in advance, from the level alone, which kind of morning you're looking at.