Depends on implementation. One way, which is less private, show active installs by having the phone reports back to the store if it's unstalled A more secure

Depends on implementation. One way, which is less private, show active installs by having the phone reports back to the store if it's unstalled A more secure way, show downloads for each version/build. Graph it. If an app is releasing/being updated regularly but more users are uninstalling, you'd expect the downloads per version to decrease or stay level