Trend Envelopes and Bollinger Bands are both technical indicators used to analyze price movements, but they differ in construction, purpose, and behavior under changing market conditions. Trend Envelopes are built by plotting fixed percentage bands above and below a moving average. These bands remain constant regardless of market volatility, making Trend Envelopes particularly useful for identifying trend direction, overextended prices, and mean reversion within stable trends. Traders often rely on them to spot pullbacks and continuation opportunities in trending markets.

Bollinger Bands, in contrast, are volatility-based indicators. They consist of a moving average with upper and lower bands calculated using standard deviation. As volatility increases, the bands widen; when volatility decreases, they contract. This adaptive nature makes Bollinger Bands effective for detecting volatility shifts, potential breakouts, and squeeze patterns. They are widely used to anticipate periods of market expansion following consolidation.

Another key difference lies in signal interpretation. Trend Envelopes tend to generate clearer signals in well-defined trends but may produce false signals in choppy or sideways markets. Bollinger Bands are more dynamic and responsive to sudden price changes, which can be advantageous during volatile conditions but may lead to frequent signals. In summary, Trend Envelopes emphasize trend structure and consistency, while Bollinger Bands focus on volatility and market expansion, making each suitable for different trading strategies and market environments.