duolingo

The stock is down more than 30% in barely two weeks, and it’s approaching key support levels that could make this a turning point.

U.S. users are flocking to RedNote, a social media app set to a default language of Mandarin Chinese.

Not everything -- including apps -- has to be all bells and whistles all the time.

Luis Von Ahn, co-founder of the popular free language-learning app, opens up about his passion project's past, present and future.