card2brain is a free learning platform that allows you to create and study flashcards with your friends in a fun and social way. The app is designed to be used in school and university. It is used by students to improve their grades and learn new languages. 

With card2brain, you can create flashcards of your own in a browser or on the app and revise with your mobile while you are on the move. You can study and create your flashcards anywhere, even offline. You can also share your flashcards with your friends and comment on or rate the other users.

The app has three modes: the first one is for the students, the second one is for the teachers, and the third one is for the general public. You can also create and study your flashcards in a classroom with a group of students and teachers.

The app has two different ways of studying: the first one is for the students and the second one is for the teachers. The students will be able to see their progress and the teachers will be able to see the progress of all the students in the class.