Today's volatility
Volatility compares two daily readings. These charts were first read here on 2026-09-14; the first index appears after the next daily reading.
How the index is calculated
Each list gets an index from 0 to 100, built from three measurements against the previous daily reading of the same list: the share of its top 10 places now held by a different app (40%), the share of the list that was not in it the day before (30%), and the average rank change of apps present on both days, capped at 10 places (30%).
A category's index is the average of its top free, top paid and top grossing lists. The only input is Apple's public chart feed; a chart position is not a search rank.
See this for your own app
Paste your store link, add your keywords. Rank, the apps above you and demand are measured every day.
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