happn is an interesting application that lets you know if you're about to cross paths with someone in real life, which has a profile on this platform. The reason behind this feature is to help you approach someone that you like. In order to use this app you are required to create your own profile and to update it with the essential information.
The user interface comes with a well-designed layout. Inside the Timeline section you are able to see a list containing all the profiles you've crossed paths with. It even goes as far as showing the amount of times you run into each profile, plus where and when. Keep in mind to configure the application to show only notifications based on your interests.
There's no reason to get bothered by someone outside the age range mentioned about you. The application lets you send likes to people that you like, you can also give a secret like if you're shy. In case the other person likes you as well, then there's a match and you can start chatting with eachother.