New User Retention

[JPhilippe]

Hi, 

I'm working on downloads and retention figures for an iOS app.

I have compared the itunes figures (App Units) and the New User figures (from Firebase > Retention), and there is 100% of difference between both.

Did you already see a so huge difference?

How can I explain this gap?

Thanks a lot

JPhilippe

[Ian Barber]

Hard to say without a few more details. Are you checking first_opens? What is the direction of the difference?

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[JPhilippe]

Thanks for your answer.

I use the "new user" figure coming from the retention section.

It's around twice the number of download (app units) on iTunes.

This figure on itunes sounds good.

By the way the "new user" figure is consistent with the "new users" (in Firebase)

I'm checking the sdk integration too, cause it's really strange to have such a difference.

[JPhilippe]

I'm checking new users in the retention section.

New users are twice the number of App Units, on itunes.

This figure sound good on itunes.

Le lundi 20 août 2018 22:27:37 UTC+2, Ian Barber a écrit :

[Jean-Philippe BRIGUET]

Hi Ian,

We check the firebase implementation, and everything sounds good.

Have any idea about this huge difference?

Did you already notice this kind of behavior?

Thanks!

Jean-Philippe

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[Ian Barber]

Sorry, I'm still not sure what the difference is! The retention graph is showing percentages of cohorts over times, so I'm not sure how you're comparing it against a downloads number? Would you be able to give specific examples of numbers that don't match up?

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[Jean-Philippe BRIGUET]

Hi Ian,

 

Thanks for your answer.

 

In iTunes Connect, I can see the number of downloaded apps.

It is called « app unit » :

« The number of first-time app downloads made on the App Store using iOS 8 or tvOS 9, or later. App updates, downloads from the same Apple ID onto other devices, and redownloads to the same device are not counted. Family Sharing downloads are included for free apps, but not for paid apps. »

I have compared this figure with the number of new users in the cohort analysis of user retention.

26 new users (Firebase) VS 14 app units (iTunes)

This would mean the firebase sdk is initialized twice per download.

This is strange…

 

And this ratio is stable for a bunch of weeks:

I thought it was maybe the SDK implementation, but we checked it and everything seems good. There is only one Instance-ID generated by app.

 

The problem may come from iTunes.

But it’s a really core data, and they generate it for a while.

 

What about you?

 

Thanks a lot for you precious help.

 

Jean-Philippe

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[Ian Barber]

Yeah, that seems pretty consistent. I don't have a good explanation for the difference there - is there any other potential source of users (e.g. versions of the app distributed over testflight, use of Firebase Test lab or other testing tool, or similar)?

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