How to check if a specified app is installed

Hello, as some of you may know, there are some apps that can hack in app purchases or make other unauthorized modifications to the app (not gonna mention the name) and so I 'd like to make an app impossible to use until the user uninstalls the app.
How can I check if a specified app is installed?
For example:
If “app_name” is installed then show popup “error”.
Could be very useful for those who have these apps installed if I want to make sure that no one tries to change my apps settings…

You can use the Package component from Utilities to check if installed



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