You could check the reviews of the app and see what people have said in the App Store. If it was a popular app, there is probably talk. I don’t know if it’s still possible to backup apps anymore? You used to be able to. You used to be able to keep an actual copies of them as part of your backup.
But anyway, the third party apps aren’t updated when you do an iOS update, but it’s possible that something in iOS 12 might cause the app to not operate properly, so it’s still a risk.
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