Duolingo's Q4 revenue growth was impressive, but conservative guidance and rising costs weigh on the stock. Read why DUOL ...

Most of Duolingo’s A.I. costs are tied to an OpenAI -powered video call feature introduced last year, CEO Luis von Ahn told ...

Duolingo beat Wall Street's targets for subscribers, total users and revenue in the fourth quarter. But Duolingo stock fell ...

Duolingo's mascot faked his death to get users to do their daily lessons, and attention from pop star Dua Lipa. Here's how he ...