Nick Frost / 90.5 WESA

Apple has chosen a Pittsburgh-born app as its free app of the year.

Duolingo teaches people how to speak a new language, and it's been downloaded more than 10 million times since being released a year ago. 

Duolingo CEO Louis Von Ahn said more than a billion people are trying to learn a new language. He believes two-thirds of them are from the lower rungs of the socio-economic ladder, and the reason they are learning a new language is because they are trying to get ahead in life.