What apps do you use to organize your contacts? (friendapp.com)

Hi. I've been working on FriendApp, a new productivity app to help you focus on your local friends. I've become more aware about how much time we spend interacting with people virtually that we don't see on a regular basis, or perhaps have never met. And I think we need tech to help us bring that focus back a bit to local relationships that have greater chance to be IRL

I was wondering if anyone uses other tools to keep a local list of people they want to stay in touch with, or any other hacks they may have done.

FriendApp is only available for iOS at the moment, but I certainly welcome any feedback on the early version available at https://www.friendapp.com