Koolearn Technology Holding Limited provides online extracurricular education services in China. It operates through three segments: College Education, K12 Education, and Pre-school Education. The College Education segment offers college and overseas test preparation courses to college students and working professionals. The K12 Education segment provides after-school tutoring and preparation courses for high school and national college entrance exams. The Pre-school Education segment offers online educational content delivered through its Donut English-learning and child education apps. The company provides pre-recorded online education packages to institutional customers, including universities, public libraries, telecom operators, and online video streaming service providers. It also provides software and technology, and education advisory services. The company was founded in 2005 and is headquartered in Beijing, China.