How strong a trend is, not which way it goes.
ADX rises when price moves decisively in one direction, up or down. Below about 20 the market is directionless; above 25 a trend is under way.
+DI and −DI tell you the direction: +DI above −DI leans up. TradeXtool smooths ADX the way Welles Wilder defined it, so the numbers match charting platforms.
Worked out by the same code the builder uses, on stored daily candles. Move a setting and the line moves with it. This is what happened, not what will happen.
Gate: ADX(14) is above 25, so you only trade trends.
A high ADX can come from a crash just as well as from a rally. Always pair it with something that gives direction.
No indicator predicts the market on its own. Build the rule, then test it on years of history with fees included. Try TradeXtool free for 14 days.