Aroon (Aroon Up / Aroon Down) — what it is and how to use it in trading
Definition
Aroon is a pair of 0-100 oscillators measuring how long it has been since the last new high (Aroon Up) or low (Aroon Down) within the last period candles — a way to gauge not just a trend's direction, but its "age".
How it works in the builder
The aroon_up and aroon_down operands take a period parameter (default 25). Aroon Up is higher (closer to 100) the more recently a new high was set — a high reading is read as a strong uptrend. Aroon Down works the same way but mirrored for lows.
What it looks like on the chart
Both lines are always drawn together on a 0-100 scale with a dashed midline at 50: the selected operand ("Up" or "Down") is highlighted as a bold, labelled line, the other as a thin, muted dashed line.
Typical use
The classic signal is a crossover of the two lines: aroon_up crossed_above aroon_down for an emerging uptrend. Both lines sitting near their extremes at once (Up near 100, Down near 0) is used as a strong-trend confirmation filter.
Common pitfalls
Because Aroon measures only "how long since the extreme" rather than its magnitude, it can read as a "strong trend" even during a mild, low-amplitude drift, as long as new highs/lows keep appearing on schedule. In a tight range both lines tend to oscillate near the middle without a clean crossover, offering little useful signal.
This block is available in the strategy builder
137 no-code blocks — build an entry condition with this term and test it on history
Historical results do not guarantee future ones. The service is an informational and analytical tool, not an individual investment recommendation; trades are not executed.
Aroon Up
Block variants
Aroon Down