App stats allow you to track how your app's performing against different metrics and timeframes. You can use this data to inform any changes you might want to make to your app, depending on its performance. Stats are updated daily.
Payouts and revenue data
The Stats page doesn't show any financial data relating to payouts and revenue. To see this check the Payouts dashboard.
Apps included in bundles
The Upgrades stat also includes bundle upgrades. This means you may notice a slight difference between this data and your payouts data.