True Strength Index Indicator: Oscillator for Momentum and Trend Direction

Sep 05, 2025

Explore the True Strength Index, a powerful momentum oscillator that enhances trading strategies by identifying trend direction and momentum strength.

The True Strength Index (TSI) is a momentum oscillator designed to help traders identify trend direction and momentum strength while reducing market noise. Created by William Blau, it applies a double-smoothing technique to price changes, offering clearer signals compared to traditional oscillators. For a primer on the classic formulation and history, see this overview of the. Here's what makes TSI useful: