Hi Brad. I use only StockCharts and have no knowledge of other systems.
A single keystroke for any strike shows bid/ask for volume of contracts and prices for each. Works pretty rapidly so is most useful by watching the changes for some seconds or a couple of minutes, depending on the activity of that strike. When I have particular interest in only (maybe) a couple, useful information can be added to what I deduce from other indicators on the charts.
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