The title may look “Clickbait”, but in exaggeration: the Popin * it really works like that, thanks to Bluetooth LE technology.

Although it is currently only in English, the application was created by Brazilians from XRay Soft. developer responsible for games like A Pig’s Dream and Natural Basketball.
The great thing about the app is that, to work well, it needs to be installed (but not necessarily open, it's worth noting) on iPhones near you. In other words, the whole success of it depends on a massive adoption.
As the video shows, when you meet people close to you you can communicate from within Popin *, even using emoticons from a cart “carousel”. It also allows you to send “secret” content, which is difficult to see by those close to you.
Popin * s needs a connection to login with Facebook. Then, you can even be on a boat at sea or inside the subway that it works on.
Future versions of the app will incorporate Apple Watch support and localization for several languages, including of course Portuguese.