It's 7am on a Monday, and your alarm clock goes off. You aren't ready to get up yet, so you make a down gesture with your arm, and the alarm stops. Five minutes later, you need some music to help you wake up. You twist your arm to the right, and the digital radio starts to play.

As messaging apps reach saturation point, unconventional alternatives are rising to the surface; from Yo! – which allows users to only send the word 'Yo' – to Backchat, in which all contacts are initially anonymous. Now, fashion brand Miu Miu has launched its very own addition.

Ever passed someone on the street and wish you'd had the courage to get their number? French dating app Happn ensures that'll never happen again – provided they also have the app. It combines the spontaneity of apps like Tinder with specific geolocation functionality.

"People think it's just an app that says 'Yo,'" Yo founder Arbel told theNew York Times. "We like to call it context-based messaging.” Effectively, Yo really is just an app that says 'Yo'. So why has it already been used four million times and attracted $1 million of investment?