Volatility Quality Index (VQI), by Thomas Stridsman, points out the difference between bad and good volatility in order to identify better trade opportunities in the market.
This plots 3 lines: - Red line is the VQI (actually, sum of VQI). - Green line is the 9-period SMA of sum_of_VQI. - Orange line is the 200-period SMA of sum_of_VQI.
Stridsman suggested to buy when VQI has increased in the previous 10 bars (use the SMAs) and sell when it has decreased in the previous 10 bars. IMO, use this with your other indicators as a confirmation signal.
To use this indicator in your charts, click on "Share" button (top right on the chart). Click on "Make it mine" button on the dialog that pops up. Now, you will have a copy of this chart with the indicator's source code in it. Click on "{}" to open the source code of VQI_LB and save it to your custom scripts section.