We develop the free learning platform serlo.org, which offers intuitive explanations, courses, videos, exercises and sample solutions for math and other subjects. Students use these to learn according to their individual needs and at their own pace. Our impact goal is, to support especially those students all over the world, who can’t afford the additional private tutoring they would need to succeed in school. Serlo.org is completely free of charge, free of ads and we use open licences. Please visit https://en.serlo.org/serlo for further information