August Garry is an Associate Editor for iPhone Life. Formerly of Gartner and Software Advice, they have six years of experience writing about technology for everyday users, specializing in iPhones, ...

Duolingo was part of a free education wave that hit the internet in the early 2010s, as entrepreneurs saw the tools of the web and mobile to as a way to open up entrenched institutions to the masses.

95 x 58 cm. (37.4 x 22.8 in.) ...

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Language-learning app Duolingo makes around $500 million annually, despite offering all of its lessons for free. WSJ explores how the company is using AI and A/B testing to keep users hooked.

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