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: 
Now you can check application usage by iOS version at
<https://analytics.itunes.apple.com>.  

The URL is memorizable enough. Mnemonics!

Let me attach a screenshot from a different post as an example:

[iTunesConnect - Download automatically app's usage analytics](https://stackoverflow.com/questions/31620111/itunesconnect-download-automatically-apps-usage-analytics)
[![sample](https://i.stack.imgur.com/z7IkP.png)](https://i.stack.imgur.com/z7IkP.png)

For more screenshots, please check this post:

[Missing iOS 7 App Usage data in iTunes App Analytics?](https://stackoverflow.com/questions/35881793/missing-ios-7-app-usage-data-in-itunes-app-analytics)
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