Andrea created his app School Planner while he was still at high school. He saw many of his fellow students struggling with organization, so he made a place to take notes, upload timetables, and track homework and test results. More than 15 million downloads later, he is still a one-man company, balancing the running of the app alongside his PhD studies and a job as a teacher. Andrea plans to build a series of apps that will draw on the social side of school, as well as studying help and advice.

Walking around the monuments, sites and nature of Italy can work up a thirst. That's why Massimo put the country's fountain database into an app — so anyone can easily find the nearest fountain with fresh flowing water. And the impact extends beyond quenching people's thirst, it's helped reduce plastic bottle circulation and revived an interest in Italy's decorative fountains. As a result, local authorities have stepped up their involvement in restoring and maintaining these coveted water sources. Next, he wants to add an icon to differentiate sparkling water fountains for those looking for a little extra fizz.

Valerio grew up in a boisterous family, where the children loved combat sports - that's where he found his passion for boxing. He trained as a neuroscientist, building PunchLab: Home Boxing Workouts in his spare time with his friend Simone. But what started as a personal fitness aid quickly turned into a business. The app measures hits on a punch bag, with interactive routines and coaching. Valerio is especially proud of feedback from people with multiple sclerosis and Parkinson's, who say it's helped them with strength and coordination, and enjoy exercise again. The pair has recently added a leaderboard and plans to offer workouts in more languages to expand globally.