Just a Chaikin Oscillator slightly tuned to show extreme changes in A/D momentum.
- Red histogram means the fast EMA is way above the slow EMA (strong distribution). - Green histogram means the fast EMA is way below the slow EMA (strong accumulation).
Divergences are also easy to identify. When the price pushes more than the histogram, hidden selling could be taking place near tops, and when the price drops but the histogram doesn't follow, accumulation could be taking place.
This, coupled with VSA analysis, is all you'll ever need to understand price action.