Pre-market and after-hours price movements may occur with low volumes, but they can be an important part of technical analysis.
TrendSpider lets you add pre- and post-market data to applicable charts with the click of a button (#1).
After clicking the button, the chart will tint/shade non-regular market hours trading activity (#3) with regular hours appearing in white (#2). The Separation Lines button to the immediate left of the Pre- and Post-Market Data button displays lines that drop down to lower indicators to make it easy to see when crossovers and other events occurred.