Google Education
Google Classroom is a education app by Google earning an estimated < $5k/mo on the App Store with 700k installs a month. Below are its 8 current App Store screenshots.
Google Classroom generates an estimated < $5k per month in App Store revenue, from around 700k downloads a month. Its listing holds a 2.0-star rating across 35,204 ratings. The app has been on the App Store since 2015. Figures are monthly estimates of worldwide App Store performance.
Classroom is a free service for schools, non-profits, and anyone with a personal Google account. Classroom makes it easy for learners and instructors to connect—inside and outside of schools. Classroom saves time and paper, and makes it easy to create classes, distribute assignments, communicate, and stay organized. Classroom is designed to help teachers create, collect, and grade assignments paperlessly, including time-saving features like the ability to automatically make a copy of a Google Document for each student. It also creates Drive folders for each assignment and for each student to help keep everyone organized.
From the App Store listing.