busuu is a social learning app for languages. It is available on web, iOS and Android. Courses are available in twelve languages: English, Spanish, French, German, Italian, Portuguese (Brazil), Russian, Polish, Turkish, Arabic, Japanese and Chinese. Learners select one or more of these languages and work through the self-paced lessons, studying vocabulary and grammar, which they can then practice in spoken or written conversations with native speakers in the busuu community. As of December 2017, busuu numbers more than 80 million registered users in its community.