TSI (True Strength Index) — what it is and how to use it in trading
Definition
TSI (True Strength Index) is a momentum oscillator built on double exponential smoothing of the price change, making it smoother than a plain RSI or MACD, while still oscillating around zero.
How it works in the builder
The tsi operand takes window_slow/window_fast parameters (default 25 and 13) — the periods of two sequential smoothings of the price change, and of its absolute value.
What it looks like on the chart
Drawn as a separate panel, a smooth line with no strictly declared upper/lower bound, oscillating around zero.
Typical use
A crossover of the zero line or a chosen level is read as a momentum shift, usually more reliable than a noisier single-layer oscillator. Typical condition: tsi(25, 13) crossed_above 0 as a trend filter.
Common pitfalls
The double smoothing cuts noise at the cost of lag — like TRIX, the signal arrives later than a more responsive single-layer oscillator such as a short-period RSI.
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.