The explanations in the application and in the textbook are entirely in English. The application is intended for users with an intermediate level of English, and we have made sure that the explanations are understandable for B1/B2 level learners.
However, if you feel that it is necessary to provide explanations in other languages, please send us a message through the live chat! We'd love to hear your feedback. This helps us prioritize each feature to be developed to make your experience even more enjoyable 🤗