Search engine isn't Google's only product. And since you use "app", I presume you mean "any kind of software", in which case yes, it's called Google Analytics.

Search engine isn't Google's only product. And since you use "app", I presume you mean "any kind of software", in which case yes, it's called Google Analytics. You don't have to ever use any Google's site, but you are still tracked by them almost everywhere. Although that probably isn't very relevant to this case....