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What is App Store Analytics?
What is the use of App Store Analytics?
What can iPhone analytics tell you?
Apple's App Store Connect Analytics provide various insights about your app. However, the segregation based on device model type is something that is not made available to publishers.
For details about what data is made available, see this web page:
- App Analytics - App Store Connect
Further to Nimesh's suggestion.
But it requires the following roles "Account Holder", "Admin", "Finance", or "Sales" but as a "developer" one can not see those metrics.
For more information, please follow: https://help.apple.com/app-store-connect/#/itc623752a8d
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
For more screenshots, please check this post:
Missing iOS 7 App Usage data in iTunes App Analytics?
The answer by computingfreak is a little outdated now as iTunes Connect was changed to AppStore Connect in the past couple of years.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: