1.Tracks the people you have been in contact with using a service that is running in the background and changes when you saw those people.
2.You can add contacts using the contacts app.
3.Lets you add date last seen using a calender.
4.Has notifications built in to notify you if one of your friends has corona and in turn flags you and your friends.
5.Checks the user's location in the background and compares it to other users to see who you are near.
6.Uses Firebase to store the information about the users.
7.Has phonenumber authentication with Firebase.