"Duolingo at this point is really all in on AI," Klinton Bicknell, Duolingo's head of AI, told me in an interview this month. The company said it's been invested in AI features since its launch ...

Learn more about my experiences with Duolingo, Babbel and Pimsleur below, including the sign-up process and lesson structure for each one. SKIP AHEAD Get to know the apps | How I tested the ...