What it does
The Accumulative Swing Index (ASI) is Welles Wilder's running total of the Swing Index, a formula that scores each bar from roughly -100 to +100 using the relationships between the current and previous open, high, low and close. By accumulating these scores, ASI produces a line intended to be a 'purified' version of price that isolates real swing strength. It was designed for futures but is applied to any market.
How to add it
Click Indicators (ƒx) in the header.
Search “Accumulative Swing Index” and click the result.
Hover its legend row and click the gear to open settings.
How traders use it
- Trade ASI like price: draw trendlines and support/resistance on the ASI line, and treat an ASI trendline break as an early confirmation of a price trendline break.
- A rising ASI making higher highs confirms an uptrend; a falling ASI confirms a downtrend.
- Divergence between ASI and price (price makes a new extreme, ASI does not) warns the swing lacks internal strength.
- Wilder's rule: a breakout in price is validated only when ASI also exceeds its value at the previous significant price swing point.
- Use it as a confirmation layer for breakout trades rather than a standalone entry generator.
Inputs
| Input | Type | Default | Range / Options |
|---|---|---|---|
| Limit Move Value | number | 10 | 0.1–100000 |
Plots & styling
| Plot | Style | Default color |
|---|---|---|
| ASI | line | #2196F3 |
Every plot's color, line width and visibility can be changed on the Style tab. Precision (default 2 decimals), price-scale labels and status-line values are configurable at the bottom of the Style tab.
Tips
- Reference levels (where the study has them) are editable — tune them to the instrument you're trading.
- Hide the study from the legend eye instead of removing it when you only want it out of the way temporarily.
- Merge multiple oscillators into one pane from the legend ⋯ menu to compare them on a shared axis.
Watch out for
- The formula depends on a 'limit move' style scaling parameter that has no natural value in non-futures markets, making levels somewhat arbitrary.
- As a cumulative line its absolute value is meaningless; only its shape, trend and divergences matter.