Duolingo's new crew of AI tutors will help you learn languages

Duolingo, the popular free language-learning platform, launched three language "tutors" in its iOS app today, marketing the AI-powered chatbots as a way of helping users learn a new language without having to pay for expensive lessons. Users can text back and forth to practice a new language, giving learners an eternally patient, nonjudgmental, on-demand instructor.
Chatbots, the services you interact with via a chat interface like Facebook messenger, have been hailed as the next big thing