install tracking data discrepancy

  • 17 January 2024
  • 0 replies

I’m measuring behaviour for a mobile app, it’s a free app. 

I’m seeing a major discrepancy between the number of installs registered by Apple App Store Connect & my internal database data vs. an event I’ve defined that gets fired when the user views the splash screen in the app.


for example, for the same time frame

  • App Store connect shows 1300 first time downloads 
  • My internal data says it’s 1270 first time downloads
  • Amplitude reports 1110 users who fired my splash screen event for the first time
  • Amplitude reports an even lower number of 948 if I look at “New Users” 

As you can see there’s a 14% difference between Amplitude and Apple at best and a 27% difference between Amplitude and Apple at worst. 

I can’t seem to figure out why there’s such a big difference. I read the FAQ regarding IDFA and it doesn’t seem like App Tracking Transparency is the cause here (source)

Can someone help me? 

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