This app is a waste of time and kb to download it.
I downloaded to track single app WiFi data usage on my iPhone. Even one of the screenshot on the App Store shows that function. Well the function doesn’t exist. They suggest in their website to hit the button feedback in the app. It doesn’t exist either. I sent 2 email in the last week to support and they went unanswered. Probably they are out of business already. Well no wonder with an app like that…