Question: I have an app on Apple Store and I would want to know the breakdown of devices running iOS 7, iOS 7.1, iOS 8, etc. However, this information doesn't seem to exist on iTunes Connect which is just showing breakdown of devices like iPhone, iPad.

My question is can we find the breakdown of the devices based on iOS version for an app on Apple Store? This will help me decide which iOS versions the new release should be targeted.

Thanks.

Answer: 
The answer by computingfreak is a little outdated now as iTunes Connect was changed to AppStore Connect in the past couple of years. As of January 2021, one can open AppStoreConnect, go to the Analytics section, choose your app, change the measurement drop down Platform Version and view a breakup in different iOS versions, like illustrated in the following screenshot:

[![enter image description here](https://i.stack.imgur.com/V08X2.png)](https://i.stack.imgur.com/V08X2.png)
If app is already on the store then i doubt tracking this would not be possible.

what you are looking for is the analytics so try using open source tool named [flurry](http://www.flurry.com/) OR [google analytics](http://www.raywenderlich.com/53459/google-analytics-ios) to track this. 

But you may integrate this in the new version of your mobile app

Hope it helps