Our extension is part of studylib.net platform. Users can learn their sets both in the extension and on the website using PC or phones. This is possible because

Our extension is part of studylib.net platform. Users can learn their sets both in the extension and on the website using PC or phones. This is possible because the user's progress data and sets are stored in one place. So, we need authorization. But you can create account with any email if you don't want to sign in with google or facebook. Momentum is nice extension, but it has different functionality.