Keeping Score 123 FIGURE 7.4 Daily AppFigures summary e-mail. Also a useful tool for tracking user activity within your apps is Flurry (appempire.com/flurry). This takes bit of extra programming within your apps but can give you powerful insights, such as how often and for what duration your customers are using your apps. USING STATS TO YOUR ADVANTAGE We talked about the importance of constantly improving your app marketing in Chapter 6. It's not only about how good your apps are. It's about how good you are at quickly and appropriately adjusting to market changes. Constant improvement is the mechanism that moves this business forward and keeps it sustainable.