The Commodity Channel Index (CCI) has the look and feel of the RSI indicator. But, the underlying mathematical formula, as well as the application is completely different.
While the RSI oscillates between 0 and 100, the CCI has no upper or lower limit.
Instead, the indicator, under normal market conditions, fluctuates between -100 and +100 levels. When it remains within this normal range, it signifies that there is a lack of a strong trend in the market and signals that the asset price will likely remain range-bound.
By contrast, a reading above +100 indicates a strong uptrend and when it goes below the -100 level, it signals a strong downtrend.