Ever since smartphones became the default computers that we carry our pockets, the apps that run on them and the stores that sell these apps have created a new kind of economy for software. Apple’s App Store has swelled to more than 2.5 million apps, while the Google Play Store surpasses that with 2.8 million apps available. But even as these companies boast about the payouts to app makers — last month Apple said that developer earnings had surpassed $70 billion — the truth is that many app makers have a hard time making any significant money from their mobile app businesses.

That’s partly what inspired filmmakers Jake Schumacher, Jedidiah Hurt, and Adam Lisagor to spend three and a half years producing a documentary about apps — or…

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