Coucou is a free social networking app for Android phones. The app connects you to people in your immediate area (the so-called "Coucou world"), letting you meet new people nearby, just like on Facebook or Twitter. It uses hyperlocal discovery, so you don’t need an Internet connection to chat with people you may have already made eye contact with.

Coucou is also a social gaming app, with a bit of a game aspect to it. You can try to guess who is sending messages and who is talking to you. It’s a bit like a game, with a score based on how many people you’ve talked to. If you find yourself talking to someone a lot, you can send them a private message to say hi. It will also notify them that you have sent a message.

You can also send a message to everyone in your area, even if you aren’t using the app. It will work just like on Facebook or Twitter. You can also rate the messages you receive, to help other users to find the right people to talk to.