Studies · Momentum
True Strength Index (TSI)
trueStrengthIndex · Blau's TSI — double-smoothed net change over total change
Drawn in its own panelReads one column (close here)Guide lines at 0
Hover the chart to read values · practice data: a seeded random walk with no overnight gaps
What it measures
The bar-to-bar change smoothed twice, divided by the size of the change smoothed the same way. It is the share of recent motion that went one way, from −100 (every bar down) to +100 (every bar up).
How traders use it
- Crossovers of TSI and its signal line.
- Zero-line crossings for the trend direction.
- Overbought and oversold levels that depend on the instrument; around ±25 is common.
- Divergence from price.
Parameters
| Name | Value | Default | Allowed | What it does |
|---|---|---|---|---|
| longPeriod | 25 | ≥ 1 usual 10–50 | The first (longer) smoothing. | |
| shortPeriod | 13 | ≥ 1 usual 5–30 | The second (shorter) smoothing. | |
| signalPeriod | 7 | ≥ 1 usual 3–20 | EMA of TSI used as the signal line. |
Outputs
| Value | The TSI line. |
| Signal | An EMA of TSI. |
Drawn in one colour, one line per output, told apart by line texture. Hover the chart to read each one.