How to track how much I use my iPhone?

My wife and I disagree about who uses their iPhone more. Is there an app that will track (not the data used or minutes used) but how much the iPhone is on, clicked or used I any given period?

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This question doesn't have much detail, but from what I read, what you are looking for is the information given in
Settings-General-Usage That shows your downloaded and uploaded data etc.
Hope I helped