LessonCast

LessonCast turns a textbook into short video lessons in the language a child speaks at home. The problem: in Cameroon and across Africa, most children learn in French or English, languages many of them don't speak at home. Parents often know the subject, but they can't follow the textbook, so the knowledge stays at school. Classes are crowded, textbooks are scarce and mobile data is expensive. What it does: a teacher uploads a textbook as a PDF (typed or scanned, up to 600 pages) or photographs a page. LessonCast splits the book into lessons, and for any lesson makes a 15-second to 3-minute video in one of eight languages (Hausa, Pidgin, Swahili, Yoruba, Fulfulde, Fon, French, English): an illustrated story with the same characters in every scene, narrated, with word-by-word subtitles, objects that light up as the voice names them, and a quiz read aloud at the end. Parents who would rather read get a short written summary in their language, ready to send on WhatsApp. The video is a 480p MP4 under 10 MB, small enough for a parents' WhatsApp group. A 3-minute lesson takes about 4 minutes of model time and costs about $0.11. Live: https://lessoncast-ai.vercel.app (sample textbooks are there to try it without a PDF). Stack: Next.js, Supabase, Trigger.dev, Modal, Remotion.