I need to get monthly uninstall count for iOS using Firebase. I know that for Android, there's app_remove event that I can use even if it's not really accurate, but it's enough for now. From iTunesConnect or Playstore, they only give user retention data like how many user still use your app after x days, or daily uninstalls, which is not what i'm looking for.
There is no official method from Apple to track app uninstalls — this would have user privacy implications, and Apple has built their reputation around protecting user privacy. Given the history of public outrage around this sort of tracking, it's unlikely Apple will ever allow it.
Google Play Developer Console allows you to measure app uninstalls of your mobile app. To use this tool, you must first sign in to the Google Play Developer Console.
On the Google Play Developer Console you can see the current number of installs and the total number of installs, for a given application. You can calculate the number of uninstalls by subtracting the current installs from the total installs. uninstall_rate = (number of daily uninstalls) / (number of daily installs).
As per the firebase docs,the app_remove event occurs "when an application package is removed or "uninstalled" from an Android device." For more details visit : https://support.google.com/firebase/answer/6317485? hl=en. Follow this answer to receive notifications.
Apple has added the deletion metrics recently by which we can see the number of uninstalls. We can add filters to find uninstalls for geographic range, app versions, by device and so on. For reference: in iTunes connect app analytics in metrics under usage we can see the deletions.
Link : https://developer.apple.com/app-store-connect/whats-new/?id=iosdeletions
Right now, you can't track app uninstalls on iOS using Firebase Analytics. It's not a trivial change (I think most SDKs do this by keeping track of messages they get back from the APNs feedback service), but I'll put in a feature request on your behalf.
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